A lot of valid points. Not sure if the US is ready for it. Should it be in front of Argentina or Italy?? Another aspect is that the iRB will want a cash cow again after Japan. It's not really important if Japan is a success or not, I think it will be, but I don't think the iRB will gamble on potentially have two successive tournaments that don't bring in enough cash. I wouldn't be surprised to see South Africa in 2023 then maybe somewhere like Argentina.
I don't wanna sound like a broken record, but as Little Guy can tell you, I am a big supporter of seeing professional rugby ASAP in North America, though this may not be possible for a few years. Not sure how helpful a world cup would be if the host nation didn't stand a chance of getting out of their group, not that the U.S. or Canada are bad. I'm just suggesting that for the development of the game in North America, and in terms of competing with other sports, it would be more beneficial if the U.S. and Canada had professional athletes that could compete with the likes of Ireland and South Africa so that Americans could get rugby fever and see a real growth. The U.S. and Canada, based on the last RWC out done themselves. If their levels were stepped up they could make a knock outs, which on home soil would hopefully send North America mad with rugby fever.
Remember success breeds success!
Just a thought.