If you commit to DOpus, you just have to mentally understand that you will give in to their licensing policy. It is expensive and every upgrade will be expensive as well. But it's also the best. So if you want it, there's no alternative.
I like the program a lot. I use it every day. If I'm in front of a computer, I'm probably using DOpus once every few minutes, and if for some reason, I can't, it's very frustrating. You can get the program to do whatever you want.
Ever since you inquired about the file collections in the other thread, I've been testing it out a little more, and it is quite good.
I haven't heard of a v10 upgrade. If their schedule is similar to what they've done in the past, i wouldn't expect a new version anytime soon. Probably a year or two minimum. Version 9 is still relatively new, I think less than a year old.