We know that the primary purpose why we even have anything like altcoin is because of Bitcoin and this has been fully reflected in the fact that when there is a major event that affects Bitcoin either positively or negatively, all altcoins and a bunch of meme coins feel the effect directly.
First of all, we know that altcoins and meme coins respects the activities of Bitcoin in the crypto market but it is not all because there are some times when Bitcoin becomes all green (increases ) but some other altcoins and meme coins becomes reddish (decreases) so bitcoin is independent on it's own and most of the time, it influences the outcome of other coin but there are some altcoins that are not influenced by Bitcoin.
Again, Most of those who have had bad experiences in the crypto ecosystem are individuals who invested in some altcoins thinking it has the same potential as Bitcoin and the fact that it's always a norm in society to call Bitcoin one of the cryptocurrencies, it's no strange that altcoin might have played a great role in reducing the level of adoption of Bitcoin globally.
Altcoins didn't reduce adoption of Bitcoin in any way because if you check carefully, how many altcoins apart from ETH that has been in major competition with Bitcoin yet Bitcoin still remains the top cryptocurrency for a very long time now, so you can see that the presence of altcoins didn't affect adoption of Bitcoin at all.
This begs the question, what if we had only Bitcoin? Wouldn't the level of adoption outgrow what it currently is at the moment?
In every project, there most be competitors so this competitors literally gives more recognition to the one that is superior because investors like making comparison to know the right cryptocurrency to invest in so when they invest in altcoins and Bitcoins, they dual the difference and know that Bitcoin is more reliable perhaps they give it more value and invest more on it that is why the value increases and the price begins to skyrocket.
Bitcoin would not have had much value if not for altcoins and moreover, every one cannot invest in same project that is why we have altcoins.
Do you think that altcoin is a major distraction to bitcoins adoption?
No no, not are all like I said previously, the introduction of altcoins is what gave Bitcoin more hype and increase in it's adoption because when you compare Bitcoin and altcoins more especially the volatility of Bitcoin attracts more investors to it.