Griswold was founded on liberty and privacy.

I would say that Griswold was founded on privacy as liberty. The current case purports to apply Griswold, finding that birth control and abortion are different enough that one can be an exercise of liberty and the other not. I don't see anything illogical in that position, whether or not one agrees with Alito's conclusion, or whether or not one suspects that Alito would dump Griswold like a bad habit if he had the chance.

It doesn't much matter whether the Roe trimester scheme "worked." First, the Court itself rejected it in Casey, and second, compromise is what legislatures do, not Constitutional courts. For all we know, this Court may strike down Griswold if it feels the need, but at least as of this draft, it has not done so.