From what Barcelona has shown so far makes them so close to winning Tribble this season, La Liga, Champion League and Copa De rey and if you look at the possibility now Barcelona is at the top of the La Liga standings and if you look at the quality and consistency of Barcelona's performance so far is quite impressive compared to their two competitors Real Madrid and Atletico Madrid.
And in the Copa Del Rey competition the Barcelona team has reached the semifinals so they are very close to winning the Copa Del Rey title.
Maybe the difficult thing is winning the Champion League title because the journey is still quite long and the competition is very fierce but even so in terms of percentage Barcelona has a big chance because they have good quality.
From three titles to no title, the verge is very small and Barcelona must fight for each title. There are lessons from Bayer Leverkusen with Michael Ballack in a season he ended with second positions in three compeitions, no single title. There is a story of Liverpool in the last season with Klopp from four titles to no title (or only one title).
Barcelona are strong, have good quality and their recent form is excellent, but there are many matches in three competitions for them to win all three titles. Barcelona are capable of winning all three titles but it won't be easy and they actually have risk of finishing this season with empty hands. Copa Del Rey is very possible title for Barcelona but La Liga and Champions League titles are more unsure.