Yes I hope Barcelona will be able to compete next season with different tactics.
I so much believe that, the reason why Xavi is been sacked out of the Barcelona team as head coach, not really about Barcelona's performance so far, but because Xavi intends to leave the team before he decides to stay back to the Barcelona team(reasons best known to him). That action of his might be the reason Barcelona management was pushed to have him sacked to be replaced by Flick, so that the same act will not repeat itself again. Maybe he will go finally and to stay
As far as I know, Xavi has been very good when accepting Barcelona offer which has financial problems,because Xavi has lowered his salary and even,after this dismissal, Xavi also gave up his unpaid salary. Obviously, that is a great personality and very good that Xavi has, because eventhough Xavi should be paid high but Xavi is willing to be paid less than he should get. But evenso, Xavi is still able to show his quality and still provide good results forBarcelona. But yes, the bad thing is that Barcelona is unable to appreciate its legend but at the same time,Barcelona wants and demands good results. So yes, even though Barcelona appointed a new coach but if for example the new coach does not like the way Barcelona does the coaches and players,then I sure Barcelona will be even worse later.