Yup. Revised NeoLibs are probably best bet for "The party formerly known as" Republicans (Too soon?) to get back the WH. Bring in social progressivism combined with more conservative economics and there's something to work with imo.
You're suggesting that the lesson the GOP should take away from Trump's hostile take-over is: "Oh, you wanted us to be
more like the Democrats all along?" Which is obviously incorrect.
I agree that the GOP, as the "Party of Reagan", is now dead, and that whatever replaces it will be significantly different. I also agree that social and religious conservatives are unlikely to be a major part of whatever new coalition it assembles. But it's definitely
not going to be socially Progressive and neo-liberal economically. An opposition party has to, ya know, actually
oppose what it's counter-part is advocating. What RDU has suggested is not significantly different from Clintonism, which has been an option (indeed, prior to Bernie, the only option left of the GOP) since 1992.
Anyone who likes Clintonism hasn't been in open revolt by supporting Bernie or Trump against The Establishment™. Whatever comes next for the GOP is going to have to make major accommodations to that populist energy, which Clintonism isn't capable of doing.