Not OP, but I'd be fine with copyright being limited to exactly "must credit any works used that were created by other people".
But yes, abolishing copyright other than ensuring credit is given is the right move. The scenario you bring up wouldn't happen like you're thinking though. Disney or Sony would be free to make a movie using other people's art, but they'd have no legal means to enforce that people give them money to watch it, so behaving unethically would be a great way to not get any money from making it.
But yes, abolishing copyright other than ensuring credit is given is the right move. The scenario you bring up wouldn't happen like you're thinking though. Disney or Sony would be free to make a movie using other people's art, but they'd have no legal means to enforce that people give them money to watch it, so behaving unethically would be a great way to not get any money from making it.