As a big-D Democrat, I agree with Reihan: he should be kept as far away from the levers
of the Republican party as possible (that's a compliment!). More seriously, as someone who's sick to death of the partisan pie-fight, I hope that once the crash-and-burn of the GOP is complete, these two will be in charge of the rebuilding (that's not to say I don't hope it takes, say, three or four election cycles).
I've listened to Reihan explain his politics several times now, and Hayekian or not, I don't see any reason why he can't fit into the emerging Democratic big-tent coalition, other than maybe tribal association. He wouldn't be fully comfortable, but he can't possibly be comfortable in today's GOP, and anyway he's a self-described contrarian.
The same goes for Ross, more or less, but in his case I think abortion rights may be a deal-breaker.