Bitcoin investors are much more than altcoins we all know that but thats not important, the important thing is Bitcoin is supposed to have more investors now if only their was no altcoins in the market
Do you think the existence of altcoins affects bitcoin by an inch? they are two different things, they can't compete bitcoin and as far as am concerned, every one having one or two altcoins also posses bitcoin as their main cryptocurrency had invested in, i will admit that everyone by default have been introduced to bitcoin before any other cryptocurrency and would have developed some portfolios in bitcoin investment before advancing into making an additional efforts with alts currencies.
if you checked the numbers of investors you will understand what am trying to say.
The idea is that you can get people into bitcoin and later investing on other cryptocurrencies and some may not even go there because of the risk with alts, it's very rare of you to see an altcoins investors not having bitcoin or not to have invested in bitcoin, it's very common now that you discover people making bitcoin their first investment with an additional of other cryptocurrencies to back it up.
The competition in the market is making more investors not to invest more capital on Bitcoin.
I disagree, which competition is going, it's a choice that people made, no altcoins can have value and priority like bitcoin, bitcoin is the leading cryptocurrency and other cryptocurrencies follows, only a newbie will take altcoins for an investment but an experienced person will only invest on bitcoin and take risk on others if he wish to.