I almost mentioned French, but thought it didn't need to catch strays here haha.
To be honest I don't know much about Esperanto, but it lacks one critical requirement - to be a world language. And realistically it has no chance to be. The number of people who speak it is a rounding error.

I think what has a real shot at happening instead is that English spelling simplifies gradually and organically until it is largely straightforward. That is if Chinese doesn't end up as the next world language lol