I don't think its really a distraction since altcoins can also help people to be aware the existence of bitcoin. There are new people that has been introduce to invest on altcoins by some people they meet on internet or maybe even in real life and provably on the way for trying to earn some profit from their investments they know that bitcoin is at the top of the chain on cryptocurrency and for sure with that they would do a research to know more about bitcoin.

If your concern is they might get discourage if this people will get scam by scam altcoins then provably that's the case if the person is not really interested on cryptocurrency. But if they want to try other crypto then for sure they would start to learn on how to invest their time and money on bitcoin.