Nope. Sours are picking up, but I don't walk into my local beer store and see sours making up 50% of the ENTIRE beer selection list. I see over 50% as IPAs, with over 50% of those being Cascade IPAs.
And I apologise if you dislike that two people in one month's time had similar ideas. If that's why you dislike this thread, you must hate IPA threads about 40 times more. There have been easily 80 IPA recipe, clone, or discussion threads in this last month. Two IPA hate threads isn't bad.
You won't find sours making up 50% of the beer selection list in any store. I feel fairly confident when I make such a statement because sours are absolutely an acquired taste. IPAs on the other hand, while still considered an acquired taste, they are more beer than sours can be at times. Depending upon the sour of course.
I don't care how many IPA hate threads there are around. IPAs are indeed very popular and I think for a time they will remain popular. IPAs and APAs dominate many grocery store shelves with the so-called "seasonal" porters and stouts taking a back seat, especially this time of year. The selection of ambers are limited as well.
I like IPAs. I hated them before and now I like them, but I have days where an IPA is the furthest thing from what I really want. I find that there is a decently balanced selection in all places I buy beer with exception of a grocery store. I do think they move out some beers depending upon the season, but I could be wrong.
As for the hops. There are definitely popular hops, Cascade being one of those. Mosaic is popular to the point where they're a little harder to get in various places. I know my LHBS hasn't had them in ages. Simcoe is another and Amarillo would be the 4th that I consider hugely popular. With the right combination you can get yourself a piney IPA or a fruity IPA.
When you speak of balance and how IPAs aren't, well that is exactly the intent. This is a style that highlights hops, not malt. If you're looking for something that highlights both, there are some good ambers and browns out there that give more of a balance.
I will say that the beauty of being a home brewer is that you have the power to brew what you like. If the commercial beer selection is limited, brew a batch of something you want. You don't have to love IPAs at all. I'm pretty sure no one will mind.