The presence of Xavi as Barcelona coach to continue the tiki-taka style,
Each coach has many variations on each tactic used, so it can't be considered taki-taki an outdated tactic.
When Xavi was still active as a Barcelona player, he became the brains of the tiki-taka game and could set the rhythm of the game and the chances he created turned into goals.
This trend is being carried out by Xavi to bring Barcelona back to the spirit of the game. when the tiki-taka strategy can blend in with all players, it will be very difficult to stop the flow of incoming balls. 6 trophies in one season is proof of how dangerous tiki-taka tactics are.
Xavi needs a genius trio or midfield duo and understands the tiki-taka style. Tiki-taka needs a mature midfielder, like Xavi and Iniesta did when they played under Pep Guardiola. Pedri is considered the most potential to continue the tiki-taki trend under Xavi leadership, but he is still very young and needs experience to be a maestro in midfield.
Barcelona failure to enter the last 16 was predicted long ago. Barcelona poor appearance made Xavi task even more difficult. New players might be the right solution to improve Barcelona's performance. Hopefully Barcelona can finish in the top 4 in La Liga so they can play in the UCL next season.