Elrond is indeed good to be paired with LIBRA because with 2,000,000 transactions per second it is very fast on the EThereum network.
Then with a stable price from LIBRA, it will be a good fee for miners if LIBRA is included in the EThereum radar network.
Unfortunately, LIBRA has news that it will be on its own blockchain path and that has been thought through by Mark Zuckerberg (maybe).