One could make a pretty good case that limitations to liability enabled better capital formation and more rapid innovation in America
That was the justification at the time at, least. I don't privilege economic growth over property rights protections.
If liability protections were repealed it would have to conform to the general standard that if something was legal when it was done, it cannot be made retroactively illegal. So, companies would not be on the hook for prior activities.
We'd see an enormous increase in the usage of liability insurance and an immediate recall of innumerable products that producers know are more harmful than they've disclosed.
Over time, there would be precedent built up that would provide producers protection against facing the same baseless suits repeatedly. To some extent, that will recreate an element of current liability protections.