A young team can be an ideal solution in the long term, especially because they’ve already proven themselves in big matches. They should extend Lewandowski’s contract and let him lead the attack. It’s clear that Barca needs to bring in a few more big names, and it’s also clear that they’re not in a good financial situation at the moment but they’ll have to find a solution. In any case, Barcelona can still perform at a high level next season.
If Barcelona decides not to extend the contract of Lewandowski, I don't think it is a bad idea. The truth is that Lewandowski is getting older, and he is also prone to injuries, which is affecting the team. For the club to sign young players for next season, I think it will be an advantage to the club. The current signings Barcelona is looking into for next season will be good; at least they will strengthen the team's performance in the Champions League next season.
If I may suggest from my personal view on this regard, they can extend his contract and still sign in new players all together, so that they could see how the new set up will both work together as a team and in some cases, may have to use as substitute while the new players coming in could play most, sometimes it's not about age, but what he could deliver for them to stand and hold on.
You are right, Lewandowski is a very good player and his age those not affect his performance his still performing very well and scoring goals for Barcelona so it will be better they renew his contract and then sign a new good player so that if one disappointed the other can take over, is very bad to put hope in one basket, let's just imagine they refuse to renew Lewandowski contract and he goes and the new player they sign is not performing very well what will be the hope of Barcelona next season so they should not take that risk, Lewandowski is still fit to player and for the fact that his performance is very well Barcelona needs him, his very experienced and important to the club.
Next seasons champions League will be unpredictable a lot of teams will put more effort to make sure the lift the champions League title.