It always is sort of funny to see everyone's sets of concerns and how inconsistent they are with one another. We are a rough customer base to play to.
By way of advancing my own preferences (because, really, why not), I must point out that small and steady content changes and additions proved very popular with those of us who actually play. The Doom event, the Huntmaster, and the trade deals are the best examples. I quite honestly was surprised to see them going the expansion route given that the small, steady changes and additions route seems both easy to do and popular. (In at least one case, specifically the Huntmaster, Kyronix, admitted it was both easy and popular. For the others, I'm inferring that from available data.)
All I can say is that I hope the expansion is successful and that they can find the right balance between "getting it right" and "not making the customer wait too long." It's not easy with any customer base. Let alone us. We sort of need to accept the fact that we're crazy.
And that, once they've gotten some additional money out of us, they go back to the slow and steady content changes and additions model.
There are levels of what's called "maintenance mode" that I'm 100% prepared to accept for the rest of my days.
-Galen's player