This has really become a nightmare of big teams these days. Because they are continually losing important members of them. After Benzema's sudden departure it is normal to see people starting to talk about the probability of Lewandowski's doing the same as well this summer. However I don't feel like Barcelona will lose Lewandowski at least for now. Because I haven't seen even a single rumour about this. We are talking about Lewandowski in the end. If there was such intention by a team we would have learned about that already. But Barcelona had better create a Plan B in case of his departure. If they don't they might have big scoring problems depending on their not being able to sign a proper striker.
I also think that there is no reason for Lewandowski to leave Barcelona in search of super-profits to Saudi Arabia, following such stars of European football as Cristiano Ronaldo and now Karim Benzema. Still, I think that Lewandowski has not yet said everything he wanted in La Liga and therefore he still has to stay at least a season, especially since he seems to have a great relationship with Xavi both personally and professionally. I was much more surprised that Luka Modric decided to stay at Real Madrid, and did not leave in search of big money to the Arab sheikhs.
Lewandowski has only been with Barcelona for one season, and in his first season he was able to show something extraordinary. He can adapt quickly and he has also contributed a lot to bringing his new team to the La Liga title this season. He really wants to be at Barcelona, and I don't think he will be quick to leave this team he wants.