From a personal standpoint, I really liked territory. It annoyed me really that we had these splats that really focused on territory and had entire systems around territory that no one ever bothered to use. Downtime was a system that was adapted to a MU environment from LARPs. It was somewhat effective at limiting actions but I think that a MU runs in a way different than a LARP and needs its own system. We just never made one. That's something that will likely be fixed in the changeling game.
That being said, even our current project (Our being Cthugha, Groth, Becca and I) features a territory lite system. Mostly because territory is an easy source of conflict and something that is easily relatable to anyone in almost any splat, timeline, theme or setting in any game franchise.
@coin it will not be me, because i hate everything i have seen about 2E mage