Firstly, I think whatever system ends up being used to determine a national championship will probably include ND as an independent, so I highly doubt ND is joining a conference.
However, as a B1G fan, I clearly would be a huge fan of adding ND to to the B1G. To those of you who favor the B12, I have one question for you, how do trips to Ames, IA, Manhattan, KS, Lawrence, KS & two places in Oklahoma sound? Because you'd be playing in those places frequently if you joined the B12.
The big positive with the B1G (as has been alluded to above), is that you're playing in bigger cities (rather than the relative outposts) and in front of big crowds, which you wouldn't be for a number of the trips in the B12. Take a look at the stadiums in each conference by capacity:
1. Michigan Stadium - 109,901
2. Beaver Stadium - 106,572
3. Ohio Stadium - 102,329
4. Memorial Stadium - 81,067
5. Camp Randall Stadium - 80,321
6. Spartan Stadium - 75,005
7. Kinnick Stadium - 70,585
8. Ross-Ade Stadium - 62,500
9. Memorial Stadium, Champaign - 60,670
10. Memorial Stadium, Bloomington - 52,929
11. TCF Bank Stadium - 50,805
12. Ryan Field - 47,130
Big 12 Stadiums:
1. Darrell K Royal Stadium - 100,119
2. Gaylord Family Memorial Stadium - 82,112
3. Jones AT&T Stadium - 60,454
4. Boone Pickens Stadium - 60,218
5. Mountaineer Field - 60,000
6. Jack Trice Stadium - 55,000
7. Memorial Stadium - 50,071
8. Floyd Casey Stadium - 50,000
9. Bill Snyder Stadium - 50,000
10. Amon G. Carter Stadium - 44,358
The "bad" road trips (where you play in front of a low capacity crowd) in the B1G could be argued to be Minnesota (Minneapolis), Indiana (in your home state, near Indianapolis), & Chicago (where your largest alumni base is). I'm not saying that you would love every road trip in the B1G, but clearly it is a better option for road games than the present B12 - obviously depending on their expansion options, that could improve for them.
It's amazing how UT fans are trying to brainwash everyone into believing that, all of a sudden, the B12 is this perfectly harmonious conference that will never again experience any kind of upheaval from its members, when LESS THAN 12 months ago 4 of its most prominent members bolted for 3 other options (PAC, B1G, & SEC). Who was left? Schools who literally had no other option, plus Texas & Oklahoma. That is the conference ND wants to join? A conference full of leftovers? I get why FSU/Clemson want to join - they are stuck in basketball purgatory and have now way of getting out - plus FSU needs the cash, so I get that, but lets look at the history of Texas & conferences Texas is in: 1. SWC - dead in large part because of Texas' actions. 2. B12 - nearly died last summer, lost 4 of its most prominent members. ND doesn't make sense to me, they have a better option.
Conversely, the B1G is a conference that has been around since before the dawn of the 20th century (founded 1896) and has NEVER had a school leave in its entire history (well, except for the University of Chicago, who dropped their sports program, but they remain a member of the CIC). Further, ND has a long history of playing a number of B1G schools. Which sounds better to you: joining a conference full of members who have a history of hostility toward the conference they are in (B12 w/ the likes of Texas, OU, FSU, Clemson, Etc.) or joining a conference that has been around and stable since the dawn of time essentially?
I get the whole "national schedule" thing, but my opinion is, if the B1G could offer you 7 conference games instead of 8 in a 16 school conference, you could still have 5 non conference games to play a "national" schedule. If you have 5 OOC games scheduled, you are playing nearly have your schedule out of conference - schedule USC, Navy, Someone from Florida, & Texas - you've been everywhere around the country that way. The idea that the B1G would make ND a "regional" school is a misnomer IMO, as long as ND handles its OOC schedule properly.
What about your non revenue sports? Without any doubt, the B1G is a better fit there (most notably, in hockey & lacrosse), and if the B1G expanded to 16 with the remnants of the ACC - I could see UNC/UVA/Duke coming along with ND - those three schools have non revenue athletics that closely resemble ND's.
Finally - the 3rd tier TV rights excuse is a red herring - how many ND football games are going to get to tier 3 programming? I'd bet every single ND game each year goes tier 1 or 2. With tier 3, for ND, you are talking about airing basketball games & olympic sports primarily. I have ZERO doubt that a B1G w/ND makes way more TV revenue than the B12 does, so what are 3rd tier TV rights worth if you can get paid more by not having them?