- the flawed way that a website made popular is using market capitalization. it is flawed because it doesn't consider the "real supply" of different coins and also it is using a characteristic that doesn't belong to this market (it belongs to stocks). i posted some numbers here which you can see for more details: https://bitcointalksearch.org/topic/m.51618134
but basically 60% ish is the ratio of 17 million coins versus 12,000,000 million coins!
17,000,000
12,000,000,000,000 /
----------------------------
60%!!!
this "gap" you are talking about here, is not going to be filled by this percentage. even if bitcoins so called "dominance" dropped to 10% or rose to 99.99% it still wouldn't change a thing. the real dominance is the adoption and usage of coins in real world. to put simply, bitcoin has it and others don't.