Theoretically I guess so. I believe even the SC in Casey vs PP acknowledged that the limits of viability were moving earlier in pregnancies as medical technology advanced.<quoted text>
Would it be fair to say your use of the "legal strict definition of viability" could become practically limitless, as medical technology advances.
But something like an artificial womb would change everything...and not just the concept of viability. Abortion would likely not even be an issue anymore.