No need to ask if memecoins are risky or not. Cause memecoin are super risky catageoy in whole altcoins industry. But I don't think anything could effects crypto market due to memeocin cause memecoin are different catageoy, gaming coins, ai coins, L1 network coins are different. People will choice their coin according to their budget and their ideas. Not everything everyone is going to buy memecoin only. But yeah, some newbie may victim after buying memeocin and blame the whole crypto market is bubble, kind of scam etc. But such thing won't really effect or represent crypto market at all.
Meme coi are very risky no doubt about it. If you are to invest in altcoins you have to make up your mind that it something that you can lose at anytime, thst is why it is important to just invest only what you can afford when dealing with meme coins . It can never be predicted because many developers their concern is just to make money from it by scamming people that will invest it. Most meme coin are known to be scam projects.