Chess piece loyalty makes life easier for larger squads that want to fly together. I see no issue with trying a 2 country day for a while. Heck, just something new usually spurs some activity. I don't see chess pieces being an issue for our squad, if Knits weren't one of the countries we would just choose one thats available and all fly that.
What map is no big deal to me. If it has a bases close enough to fly to and fight and somewhere to fight with GVs, I'm good.
I would guess that with the new terrain work being done, modifying existing terrains for an experiment might not be on the green light list even if HTC does think the idea has merit, which they may not.