On topic - This is great and I look forward to the possibility of interdistrict play.
Regarding "poaching" of world championship spots, moving to a system of proportional representation districts at worlds would be a step towards eliminating the problem.
This attachment here (which I saved from another similar thread, apologies because I don't remember which one or who posted it, but this is not my original content) shows how underrepresented FiM is at worlds. Although there are many great reasons for attending an out of district regional (meeting new teams, travel experience, etc.), worlds qualification is an incentive. Distributing spots proportional to the number of teams in the district while removing qualification incentives for district teams at regionals would both calm the regional teams that feel invaded by districts, and the district teams that feel like they are getting the short end of the stick at home.