At the moment, altcoyins have almost reached their minimums and a strong drawdown if bitcoin goes up there should not be like before when all the violas were inflated at the expense of the December rally. And the dominance of bitcoin is now only 45% because recently on Cryptocurrency Market Capitalizations some 500 different altcoyins have been added that eat the advantage of bitcoin .. If you now remove 500-700 altcoyins as in November 2017 then bitcoin will again grow to 55-60%
yes, this is one cause of the fragmentation of market caps. but in some cases, it is possible that all capitalization will increase. because investors have seen opportunities. altcoins and tokens that have bad projects will be eliminated organically.