I'm not opposed to the general concept. I think more realistic rest rules are long overdue. To me, it will be important to see how the details are ironed out, especially how IROP's are handled. Any plan that ASSumes that normal ops is the usual scenario is doomed to fail. Let's face it, the normal op is now IROP. Anything that doesn't keep that in mind isn't going to work for more than a day or two before the operation completely falls apart.
I don't think transcon turns are ever going to be viable. Most are blocked for at least 11 hours. What might work are 2-leg, 10-flt-hr days. Maybe Florida to the west coast via NY or Boston. These transcon-and-a-half scenarios I think have more potential than trying to push it with a two-leg, 12-flt-hr day.
Regardless, I remain extremely skeptical until and unless they're able to demonstrate equivalent or better safety and alertness vs. the current regs.