The competition between Barcelona and Real Madrid will be even more competitive next season because both teams have made several efforts to bring in a number of players so that the fight for the La Liga title will be even tighter. Real Madrid will try to make several adjustments with their new coach while Barcelona will be much more solid because they are already well connected with the coach. La Liga next season will still be about rivalry and I am sure that both teams will compete for the title because if you look at it, there is no other team that might be able to match them in terms of fighting for the title.
Your analysis is right, both teams are very making good preparation for the next season business, it is very obvious that Realmdrid will give a good fight time although time will tell, we have seen seen xabi playing three man defense in the ongoing club world cup but let see if this pattern of xabi can be sustained and keep yielding good friut for the club, personally I will want to experience a tough battle for the league next, not only from both teams but other clubs that will be contending for the league title next season, although we know that Barcelona and Realmdrid are the teams to look up to in that league, Athletico Madrid would've been one of them but they behave like arsenal of England sometimes.