The last time Barcelona could beat Real Madrid with a landslide score, this is a good sign for Barcelona and otherwise will be a serious threat to Real Madrid. But will Xavi be able to create a consistent team in La Liga next season? That's what we have to wait for. If he manages to create that team then Real Madrid will have another tough competition.
Xavi's first season at Barcelona proved he could improve Barcelona's performance for the better. He has also managed to compete with other teams to qualify for the Champions League next season and that makes me believe that next season Barcelona will be a great challenger in Laliga. Barcelona's plan so far has been quite successful although to be honest they haven't won a single title with Xavi.
Next season, of course, Barcelona has hopes of winning the title, especially if Xavi is really able to consistently make his players appear at their best. Some new players might help him and his plans, that would be good for him and Barcelonaand also for LaLiga.
Well Xavi was quite successful in bringing Barcelona to the finish as runners-up in LaLiga, this is certainly proof of that with Barcelona as the first season that has improved his performance, at the beginning of the season Xavi must have had a lot of time to improve before it but I think it can be sustained and compete again with Real Madrid, although in a financial sense they are not yet stable, they can bring in several forwards to strengthen Barcelona, including Lewadowski.
Not only that, Xavi will continue to play in UCL as a prestigious competition, I think Xavi's goal now will be more serious.