There is no benefit for the GOP to fix the law. At this point the ACA is moving from failure to failure, media wise, and republicans are just watching it burn. I don't see why they'd want to change anything, especially the expansion of subsidies which is something they're completely opposed to.
Some plans are cheaper or slightly more expensive (for better coverage), but there are a lot of people who are stuck in a donut hole right now. Too much income for subsidies or Medicaid, stuck with higher cost options. I don't see how that can be fixed unless democrats take the house, which isn't happening.
The law is fine.
The website has glitches.
You need to stop hating on everything Obama does so much more than Republicans do.
Now drone strikes, gitmo, gitmo prisoners not having lawyers, not pushing mental health services, not pushing for better infrastructure building, willing to give up social safety net for barely anything in return, not getting rid of bush's race to the bottom(education reform), not getting rid of surveillance on American citizens, not really caring too much about food stamps, and being out of touch with poor people(frankly I only think LBJ and carter were the last two who actually did understand the poor). O, and not pushing for an individual mandate through reconciliation, or the public option, or single payer.
So yea, the website will be fixed. It's zzzzzzzzzz boring, and not hyper critical. However the law is fine.