I read somewhere that most content ceases to be profitable at about 10, 15 years past release. I'm sorry, I'm not able to find it now, but if that's true, it would mean that publishers would indeed have an incentive. The benefits from printing new editions of old books wouldn't be much in comparison, being more competition. I do, indeed, think it's true.

I somewhat feel sorry for the authors, but I think they'll manage. Being a writer is already a respected and highly-sought status, even though the pay is poor. Either way, I wouldn't claim copyright durations of ten years. But we can't stay like this eternally.