The eyewear industry is pretty saturated now and almost every design known to man has probably been made. And with the Luxottica and Safilo manufacturing almost every major eyewear brand, you can't help but expect the designs to start looking alike. They probably think they have to come out with odd-looking eyewear just to catch people's attention.
I did notice that there are a lot of extremely weird, almost (if not totally) unwearable shapes now, most gearing towards either very angular (this I don't mind, they're quite interesting) or very round shapes (my theory is it's because of the re-emergence of the Ray-Ban clubmasters).