Globalize? No thanks, there is already lag issues even on same region server when people live few hundred miles away, not happening with thousands.
I would like fuller servers, that's what merging is for but not a fan of super huge servers. And yeh having someone who played for 2+ months more go to newer server and destroying everyone will be a major issue.
There is a reason they still keep releasing new servers, because there is a demand for it. People want to start from day 1 with other lvl 1 players.