You cant just re-balance the idea groups and suddenly think that game play is going to change... It wont. Until we have meaningful things to do during peacetime (and a fixed naval game), which offers alternative game play to war, there will always be a "ideal" progression if you want to optimize. Fact of the matter this will always happen, especially if conquest is prioritized. And that's not to say that some idea groups need some loving (I have already commented above).
That said, you can always not optimize. If you want to blob, well those are the best blobbing ideas, if you dont.... who cares. There are a bunch of wacky achievements that dont involve WC style game play (just for ideas, you can make your own - the joy of sandbox), that can offer some crazy wierd setups with idea groups. My fav to this is probably the +dip rep for Hormuz. The goal is VERY different (although yeah you could just WC then re-arrange groups but come on), we need more of these achievements, and then things to do in the meantime so we dont speed 5 while reading the forums. Once that happens then suddenly alternative groups become REALLY meaningful.
Mate what is your problem? Many people don't play MP and don't care about balancing the game for MP. And when someone suggests idea groups can be balanced differently in MP compared to SP you get angry?
IMO because we have have enough UI clutter already, and more importantly what kind of MP game? If I am playing with my wife in a nice little co-op game doesnt that mean we should be using the MP version of idea? Or a bunch of people seeing how big they can blob and they have un-offical truces for the first 100 years.... I've p[played enough wierd scenarios with friends because our skill levels are so different. If we are really talking about re-balancing for competitive MP.... have a mod, or maybe optional rule sets at game creation.