Even with that drop it's still almost 100% growth in the last month - that is huge, especially compared to the 25% that bitcoin did (and even that is still incredible).
But you are right, scaleability is certainly an issue in the long term but having said that apart from those super ICOs the load on the network is way under the current limit so 99% of the time it's not even an issue....yet.
RE: Etheruem : Is it a victim of its own success?