Now THERE you’ve hit on it.
There is no reason for CONCACAF and COMNEBOL not to merge.
They had the Gold Cup Centenio a few years ago to coincide with the Euro tournament, that combined the teams from North and South America, and it was great! You had Euro games in the daytime and Gold Cup at night. They need to make this permanent, and just hold it here in the US.
I’d imagine the US and Mexico wouldn’t stand for it because they’d miss a lot of World Cups; many second-tier South American teams are (usually) better than them.