Not sure what in the world could have given you that idea.So they're giving up on TXAA?
MFAA is just a performance improvement for MSAA. You could say it is an alternative to TXAA but it does not, in any way, shape, form, or fashion replace TXAA as their purposes are very different (MFAA is the bare minimum form of anti aliasing that isn't post-AA, while TXAA kills all aliasing dead).