The flexibility to launch ERC20 tokens and easy customization provided ETH as a perfect platform for newly developed startups launch their own tokens. ICO and distribution of tokens became much more easier. The only concern regarding ETH platform is the speed and gas price. Recent cryptokitty congestion made alternative platforms like waves very popular and anyone can see lots of tokens are generated in waves (http://dev.pywaves.org/assets/) as well. Bitcoin remaining the king even in near future, my prediction is, these platforms will emerge much more with much more stability as the community involves more. NEO and EOS (and lots more) are the closest competitors in this segment.