Paris won't get it. The decision is being made next year and I suspect that security concerns will still be all too real.
I doubt LA will get it. The feeling will be its Europe's turn.
I think Budapest has a very real chance, as its eastern rather than western Europe too. Its a beautiful city.
Rome I think will have concerns about its traffic infrastructure.
I'm sat watching the closing ceremony on repeat and MARIO!!! I am wondering if there is a cat in hell's chance of us affording to go. DS will be nearly 6. We loved Tokyo, but it was SOOOO expensive when we went (and the exchange rate was pants in comparison before Brexit so lord knows what its like now).
Japan will do an amazing job I have no doubt.