If Facebook launches LIBRA then nobody will invest in it
Stable coins are created just to earn more bitcoins, Facebooks' aim is to launch a stable coin but I think people won't take any interest to invest in a stable coin because it will only offer benefits to facebook to earn more bitcoins, while the community and investors will have no benefits. I don't think that anyone will ever be interested to invest a penny in it.
All my other predictions come true (you may check bitcoin forum) but still there is no whale who ever donated a penny.
There are so many projects that issued their stable coin beside their main project token. Still, they got investors. Also, a stable coin is not like something that will give a high return of investment so people won't buy them as an investment plan. They are just to avoid market volatility. You didn't mention any points why you think that stable coin will not get any attraction in the market.