The brewery near me has more non IPAs then IPA. They usually have at least one stout or porter, an American Ale, a couple Honey ales that are very popular and a Hefeweizen, at least one fruit flavored beer and maybe two or three IPAs on tap.
IPAs are just still very popular. My pet theory is that it's partially the alcohol content as there are a lot of double IPAs that are high in alcohol content.
Oh it's absolutely alcohol content, and a little bit of holdover from hipsterism. They also have a strong taste so it's a good base to try out various different wacky flavor combinations.
I wish more places around here had American ales. Whenever I find a brewery that does it ends up being my favorite beer on the menu. I especially like the ones from thimble island and city steam.