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.
Yes youre true. There are many potential coins now that are developing greatly like Oyster. CAPP and many others but not surpassed Ethereum as many blockchains systen uses its technology for payments of transaction processing accepted mostly by some exchanges that are currently live and working.