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A good replacement for lewandoski is a very smart idea that the Barcelona team needs to buy into at this moment because dependency on lewandoski who happens to be an injury prone player at this moment will really have a negative effect on their performance on the long run.
Lewandoski has been a very good striker for Barcelona and ever since he arrived Barcelona, except for times he was injured, he has been at his very best. Now that he happens to be injury prone, if he wants to retire from the Barcelona probably after two years just like you did said, going to the Arabian side would be a good one but I think he's definitely going to have a drop in value because they aswell know what it means that he is injury pron and mind you the reason these Arab men do try getting all these big names to their league is for business purposes so if he isn't looking good for business, it's definitely going to affect his value.
Xavi can still rely on Lewa in his squad, and he proved it in the Alaves match. His instinct for scoring goals is still proven to be Barcelona's mainstay. However, the problem is that the system that Xavi implemented is not very profitable for him. So the Polish player had time to express his complaints to the coach. At the same time, several of Barcelona's core players were injured. In the end, Barcelona's performance was unstable. Plus, Lewa was injured several times. However, he still deserves to be a pure striker in the El Barca squad.
Talking about potential replacements for Lewandowski, Barcelona has actually prepared them. several players come from Lamas Sia and another is a young star player from Brazil, namely Vitor Roque. Rumor has it that Deco will accelerate his efforts to bring him to Camp Nou.
By the way, referring to when Lewa was interviewed by several sports media, he said that he would end his career at Barcelona. In fact, he even said he was not interested in accepting an offer from a Saudi League club. but who knows, maybe one day he might change his mind. And talking about the Barcelona striker's injury, the fact is that when he joined Barcelona he didn't have a very long recovery period. So, I think Lewandowski is still a player who can be relied on even though he is 35 years old.