All the above? Nearly!
I'd answer (a), but the motives are not so hidden, are they? One of the many goals is probably something PPV-like (pay for a limited-time copy, perhaps). I'm perfectly okay with this - I don't want Hollywood movies taking up valuable space on my hard drive, anyhow. If they delete themselves automatically, good riddance. This won't be the only option, though. As always, they will be glad to sell you a permanent copy or perhaps a one generation-copyable copy ...for a higher price, obviously.
As far as choices (c) and (d) are concerned, there is some truth in both. As I see it, the tighter security will result in a larger number of higher-quality films from Hollywood on cable and satellite, along with a more agressive film release schedule.
Choice (b) is the only one I'd vote against. Even if it is eventually discovered that copy protection isn't necessary for the film business to thrive, it's not a useless tonic if it relieves constipation and gets things moving.
One thing that never gets mentioned: Copy protection may help the little guys even more than it helps the big guys. The big guys have other revenue streams to tap into and they have economies of scale because their content is engineered for mass appeal. If anyone can price their movies low enough to sell them and still make a profit in a world with no copy protection, Hollywood can. If they can't, what hope is there for a small independent? Wouldn't it be deliciously ironic if the copy protection systems promoted by Hollywood ended up taking away some of their market share?