Well, having and holding supplypoints (or bases in any other rts) is kinda the backbone of the genre. I doubt they are gonna change that soon although it does sound interesting. I know there's a mod for Blitzkrieg 2 that does that, if you have the game then look for it
here.
Anyway, any game holding your interest for 2.5 hours is great, takes me back to my pre-starforce problems day in which I used to be playing (EDIT: BK2) that game online 24/7. Doubt I'll be doing that with COH but the game is more good enough to hold my attention for 2.5 hours too.