Of course yes you are right. Ethereum is the king of all Ico. Because, almost all Ico use ethereum blockchain. Or let me say 95% of the Ico use ethereum blockchain.
Do you have a source for the 95% or is that gut feeling? NEO is currently the 2nd most popular platform for ICOs but only one out 10-20 projects seem to be interested to use NEO. Ethereum has the biggest developers community and the others are not growing fast enough to overtake Ethereum in the near-mid future.