I don't know if V3 has an impact on other altcoins, but they have gone up a lot. Even cake, a copy of Uniswap, surpassed uniswap. Unbelievable things are happening.
V3 gives a very big hype to the UNISWAP and this was giving impact to the a lot of altcoins that's traded on uniswap.
This hype already expected since a few months since the V3 already announced by the uniswap developers to be released in this month. I think that there will be another hype will come very soon.
The hype caused by uniswap is so big right now. So many altcoins pumped massively. Once another big announcement about uniswap will come and boom! Bullish season for altcoin will happen.