Actually, there are very few pro-abortion Republicans left in the House; even the ones who used to claim to be “pro-choice” have been voting the right way for years. Again, no one would have predicted that even ten years ago.
I know all the pro-abortion RINOs have been wiped out here in Illinois, but that's more due to the RATS gerrymandering all of them out of existence and now having a total monopoly over the state aside from a few isolated downstate regions.
In any case, it certainly wasn't due to them being wiped out by "right wing purists" in GOP primaries. Mark Kirk used to go around voting with Planned Parenthood 100% of the time and claiming his support for partial birth abortion was somehow "thoughtful and socially moderate". If he were starting a congressional career in 2020 instead of 2000, I could see him still pulling that crap, and probably winning anyway if it were under the old district lines from 20 years ago. There's no way hardcore pro-aborts like him would start voting mildly pro-life because that's the national mood of the party.