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.
may have an influence but not a big one, like the emergence of meme coins on the solana network (bonk) then hype and slightly increase the price of solana. It may be difficult to have a long-term impact because usually the hype from meme coins is short-lived, but we have to admit that the presence of meme coins gives a different color to the crypto world.