I can only speak for myself, but I agree this sim is heading (or has already headed) for its demise.
Following the release of the SF2 versions of the SF1 games, I bought EXP1 for the P-51 and Meteor and I bought EXP2 for the mission editor.
I have bought only 3 DLC's and I am still yet to buy SF2NA.
Why? Quite simply, I don't have the time to stuff around continuously updating and adapting my modded installs while still modding.
It has taken me quite a while to complete my last few projects mainly because I haven't as much time as I used to. But I can also see my interest in this series slowly waning.
Unless the SF2NA problems are fixed I will not buy it. And in the absence of other motivation, updating my C-130's will be my last project.
Dels