Good luck Mr Romney...
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Now get the hell out of the way and let the party sort itself out within itself.
You (and your boy who forced the rules changes at the Convention) don't need to make the GOP a hobby in your retirement.
That's what they always do. Take their losers and make them power brokers within the party. They did it with Palin, and they'll do it with Ryan. It isn't going to matter who they put in charge, because not enough people want their product to keep them in business. You can't fight losing demographics with more of the same bull$h!t that caused you to lose in the first place. They didn't learn that fact with McCain / Palin, and they won't with Romney / Ryan.
The only reason they, (the Republicans), held the House is because there are still a lot of counties represented by rural America. That demographic will change in favor of the democrats as well in time. Republicans build businesses, or at least they used to. Democrats build large families that grow up to make more democratic voters.