Pro current or longer copyright terms: I made something, it's mine, I should be able to control it. Forever. Forever minus 1 day, to make it "limited times".

Opposing current or longer copyright terms: We (society) make deals with artists to incentivize the creation of works. Current copyright terms for most works, life + 70 years for works by individuals or 95 years for corporations, are 70-130[1] and 81 years, respectively, longer than necessary to incentivize the creation of new works.

I assume that 14 years is plenty of time, perhaps one 14 year extension should be allowed. 14+14 years was the original copyright term in the US: https://en.wikipedia.org/wiki/Copyright_Act_of_1790