"3 main ecosystems in the Blockchain space: Bitcoin Ecosystem, Ethereum Ecosystem, Graphene Ecosystem" ... in terms of being capitalized ... yes the first 2, correct, and Graphene seems to handle the 'load' best. But NXT/Ardor is near even in dev. ETH has several notable, and independent, clones ... ETC, UBQ, EXP. And the rest will likely not prosper, because the 'ecosystem' field is very crowded. LSK, XEM, Strat and further down the line.