I do not think that we need so much stable coins. In the last few months there were like 5 new stable coins, but I my opinion it is not necessary to have 20 stable coins on this market. Like 3-5 would be more than enough.
Of course, you do not need such a number, technically they do not bring anything new to the crypto currency, and therefore there is no benefit, let there be 3-5 pieces and all the attention of investors will focus on them, let them gain popularity and develop