Will English always be the worlds language? what will overtake it

Binary since AI

No tonal language will ever be the lingua franca.

bit tongue

Seconded

Thought

this. complimented by some sort of non-linear orthography eventually.

you think they will be tolerated indefinitely?

Either Chinese or Swahili

Absolutely, by the time they aren't it will be too late.

Chinese can't be world language because it takes too long to learn. It's pretty much useless as lingua franca.
Chinese students have to study characters all the way till graduating from high school and beyond.
It takes much longer to learn than English and it's almost impossible to rech proficiency unless you're very motivated.