I don't think libra could be available for primedice at all, so wouldn't usdt or usdc for example. This will be more about libra being a facebook related coin to be able to spend on facebook needs for people, so buying it somewhere on the third party (not directly from facebook itself) and then spending it on gambling wouldn't be proper to its own reasons to be issued.
However, if people really want to I am sure they can always find a way of doing it yet I feel like it wouldn't be needed at all, what I am trying to say is that, can you do it? Possibly, should you do it? no. That is why libra should not be in our lives and should not be used in regular crypto stuff like exchanges or casinos and should be only on facebook related stuff if you have any facebook payment needs.
I also think that in the near future Libra will not appear on the PD. although I could be wrong. For example, in Russia, one official expressed the opinion that Libra would be prohibited.
Why you both think on that?
Primedice is always up to date with latest crypto changes. I do think that if the community requests it will be added to the currencies list.
It is just a matter of community opinion which will not make things bad on Primedice side.
It would also expand the community average users with more new users.