Yes, Bitcoin is the main cryptocurrency now, not by capitalization only but it is the only cryptocurrency that is legalized in some countries as payment method.
However cryptocurrency is not only payment method or electronic cash, especially erc-20 tokens that you have mentioned. Some of them are utility tokens, such things that are being used in their ecosystem only.
And many people prefer to use altcoins for payments where they are allowed in cryptocurrency, not bitcoin. Because of the price of transaction fee.
All will spread with the time, don't worry. First time dollar itself was only in America, now it is the currency that everyone knows about
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