I don't actually see what more liquidity pools would do. There are liquidity pools now, and anyone who wants to invest in them can. So the stabilizing effect is there. In fact it is reasonably stable, and that may be one reason.

It's not enough to stabilize the price to the peg however. For that you need something that is contingent on the relationship between the price and the peg, such as the conversion functions and the stabilizer bot.

and those LPs being picked up in price feeds

I agree that should be done, but, in practice, is there a big difference in the price on the pools and the price on centralized exchanges? I suspect not, and if there is not, then adding these pools to the price feeds wouldn't do much.