We have already removed so much liability in other licensed professions, either through law or practice. It's almost impossible to obtain a malicious prosecution or SLAPP judgement against attorneys. Malpractice lawsuits have been legally capped all over the USA against doctors. Engineering liability is a joke outside of rare circumstances.

The social will for having real accountability and professional ethics just isn't there. If you license software, large companies will just outsource the stamps to small contractors who will legally assume responsibility while nothing else changes. All real accountability will be so sparse and random that all ethical complaints will be ignored. If this liability becomes large enough to effect anything, all tech companies will band together to bribe politicians to limit legal remedies in the laws themselves.

In the end, the only thing that will happen is that large companies will use these regulations to bludgeon smaller competition like they already do.