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Yes, some alt-coins have their place, but some of these are dog s*#t. Bitcoin is completely decentralised and has a cap of what can be created. Many of these alts try to emulate bitcoin's qualities but fall short. Like I said, only time will tell.

As for market cap, I don't really care how little bitcoin has of the total market. Irrelevant IMHO. When any Tom, Dick or Harry can create a new coin, what does it really matter? Big gov wants to come in and 'regulate'. Mark my words.