It's not an unreasonable worry, but the flip side to that is that he realises his upturn is down to where he is playing, he loves the setup, the stadium, his team mates and the fact that he's developing in a young and hungry team.
There are likely to be a lot of factors that may influence any decision he makes, including any advice he gets from his agent.
The fact of the matter is he hasn't kicked a ball for us at the moment, so worrying about hypotheticals is worrying for nothing.
Let tomorrow take care of itself.