> By pointing to the current system they are addressing the possibility that there could be a better system.
I think a big problem with the current system, is that (on the whole) it adopts fundamentally the same rules for completely different categories of things – such as novels and computer software.
The term of "life of author plus 70 years" was justified with reference to authors of literature, music, etc. Whether or not it is justified in that context, that was the context used to justify it. It is very questionable whether it makes sense when applied to software.
A good place to start might be with changing the rules just for software. I'd say a reasonable copyright term for software should be a small number of decades (10 or 20 or 30). Source code escrow should be mandatory, with the escrowed source code being automatically released to the public upon copyright expiration. Publication of the source code should be allowed as an alternative to escrow, so open source projects aren't burdened with it.
> No abolishing it has a better chance of killing it going forward
Radical proposals rarely succeed. Proposals for incremental reforms face an uphill battle against powerful vested interests, but the odds against radical proposals are a lot higher.