The will ever only 250,000,000 EBT.
Actually, there will only be 250,000,000 EBT proof-of-work coins. Beyond that, there will be proof-of-stake inflation. But that inflation doesn't matter to those holding coins because their total coins will inflate along with the money supply.
In other words, if you have EBT, you don't have to worry about mining's eroding your value.