First, I agree in general that the GOP dropped the ball by not using the last eight years to develop a full replacement for Obamacare, however, even on that issue it is not so simple as that; it was never about simply repealing and going back to status quo ante because the status quo ante was not good for a lot of people either, including many republican voters.
But nearly EVERY Republican Senator and House member, ran on REPEAL or on REPEAL & REPLACE.
All Trump is now expecting, is that they perform. And do not forget, passing Obamacare took until the following March 23 for signature by Obama.
So getting all "hair on fire" every single day seems to be what #nevertrump, the dems and the opposition media thrive in doing.