Probably other cause: Due to the long time that transactions are taking as the network grows.
This.
Given what is going on in the world right now (China recession and capital controls, oil countries like Venezuela having 700% inflation, Brazil in trouble and so on), BTC should be flying. it's not because of this blocksize thing.
I think people will be patient for a few more months, but after that will look for another coin that meets their needs better.