Robert Lewandowski definitely had a spectacular season in the Bundesliga. And now we are all wondering what he will decide to do for the rest of his career. He still has one more year left on his contract with Bayern Munich. He has been playing here for so many years and it wouldn't be too easy for him to decide to just leave suddenly in the end. But he should make his decision as quick as possible to put an end to this ambiguity. If he decides to leave, then I think Barcelona will sign him.
Nobody can be the best forever. Lewandowski's career will slowly coming to an end (looking only on his age). I think that signing a new contract even for a few years with such excellent results could be the best decision for him before retiring - this will give him oportunity to expect huge amounts. Barcelona definitely needs a boost in attack so Lewandowski would be perfect for them. I only wonder if Barcelona can afford to pay enough at this moment for such a player.
Well finances has been the major problem and cause of Barcelona's performance to get Lewandowski, it is very difficult for Barcelona to get Lewandowski, Xavi really needs to put in his possible best to make Barcelona Stronger the team needs money so they can get a new player who would support their career as a team not minding the age, as long as the new player is still active supporting his team it would be much better.
Like you have just said Lewandowski is Barcelona's solution right now since they are lagging behind when it comes to attacking.