Don't be so sure, and it definitley isn't something that needs to be gotten out of people's heads. Lawrence Stroll owns the team now, but, with Aston Martin on board it isn't just down to him. Yes its likely Stroll will stay, hence my post being a long shot. However, no seat in F1 is safe regardless of who owns what. If Hulkenberg has a great race and, maybe even a podium, the pressure is immediately on Stroll and Perez, and on Lawrence Stroll, to make the right choices for the team. Lance is at a point where he brings nothing to the team other than his driving ability and thats an area he needs to improve.
Add to that a recent interview where Stroll in response to a question regarding the seats he said "**** happens, business is business so we'll see what happens". Not sounding terribly confident. Lawrence is a businessman through and through and Lance knows that. You don't get where he is by making friends and being nice, plus whether Stroll is retained or not the team doesn't lose money as the investment stays regardless. So a performance based switch around is not off the table.