From my point of view, Wenger not simply want to build a team. He want to build a culture, a legacy, a heritage where Arenal will keep going producing a great team long after he's gone by self grooming a group of core players supplemented with some outside buy. Not a club who achieve greatness at one point but fade away into folklore in time to come. That's why there'a lot of work been put in the academy and the sustainable financial model of the club.
Just look at Barca, how exceptional it is their football team and academy in this era.
Unfortunately for Wenger the very foundation block has not come to realization within this few years due to the long term injury problems of good players and departures of several players that Arsenal have put their work on.
If this whole vision don't come to fruition, the club fate will depend on what kind of manager we'll get after Wenger and what decisions the board will take.