Yes absolutely!
I would love more campaigns on the level of WOL or Nova (even if it was short, I loved it too)
That is one the main problems, we can’t get rid of these units that we don’t like in SC2: Swarm Host, Thor (just a boring unit), Repear (we seen it enough), Viper ( I mean cmon, we had it enough of it), adepts, tempests etc. etc. etc.
But in SC3 we absolutely could and need to.
And none says we want SC3 right now, but it can start into development now by all means, and in like 4-5 years we can transition most of us from SC2 to SC3 (some will stay both or just SC2 or SC3 of course, like BW)
It is the best God D RTS in the world, and we can definetly learn from SC2 mistakes, so SC3 will take this legacy and be even more fun and have possibly more players.