2030 will be in Europe for sure, FIFA won't go 12 years without it returning. Really it should be England or Britain, if not I don't see anyone else who is due, except maybe Spain but Spain had it 20 years more recently than the home of football of course. 2034 may be a good call for China but Morocco or another African nation maybe in the mix too.
2030 is pretty likely to be Argentina/Uruguay so long as they can prove they have the capability. 100 years centenary with the final back in Montevideo.