To be honest any decent manager would use Lacazette and Aubameyang together, they can both score goals and are different kind of players, Wenger hasn't given Lacazette much of a chance.
I think any player will be unsure of their future as noone wil know what the new manager will do or whether they will want them, think he'll be OK though he's a very good player and finisher and those don't grow on trees. We may actually see two up top after years of this one up top formation Wenger loves so much.
You need two top strikers at least in your squad, you'd be foolish to get rid of either of them.