How do procedural maps suggest "continued support / service?" Don't they suggest the exact opposite?
I understand your point. I was thinking "procedural maps" means you want people to keep playing "forever", but to keep them hooked and/or coming back, on top of that you'd have 'events' with new loot / weapons / skins / enemies, bump up the level cap or some such, which are a less costly and more 'infinite' way to support a game than to try and pump out new campaigns every 2 months.
So procedural maps take care of the actual moment to moment gameplay, but the "meta" motivation would come from somewhere else.
I may be totally wrong though. But that's why "procedural maps" and mod support etc hinted, to me, "continued support", trying to build a durable community, etc, etc. And so F2P could be an option.
I'm not trying to call doom on this game by the way, I enjoyed the last XCOM, but I also have nothing against free to play in itself (it's the game that matters).