He was talking about do we need many kinds of altcoin in these days. So many small or even big companies just like JPmorgan are interested to create their own altcoin. This will be a problem in the future and he was asking about the potential of the problem caused by this.
We need more because we have a big market.
The adoption is not that big so we should get ready for a possible adoption, having a lot of coins will make crypto grow as that will bring good competition in the market. Whether it's a stable coin or not, as long as it has real usage, it's still beneficial for us and will help the adoption stage.