The team is in good form.This is the best chance we are going to get to get a back-to-back treble.
If we beat Atletico and win the extra match,we are going to get a solid lead(like at least 5-6 points).We have almost all the difficult matches at home,so if the team plays like they can,we should win the Liga.It still too early to say,but if we get that lead,it would require some effort to lose the league.
We are most probably going to get to the Copa semis.Real is out,and we can beat Atleti in a 2-leg encounter.The only way i see us losing the Copa is if we get Atleti at the (potential) final.
Finally,the CL is the most difficult to predict.No team has won it back-to-back,and i am honestly sceptical.However,this is going to be our best chance IMO.Arsenal is going to be really tough,but i will be surprised if they knock us out.After that,it is extremely tough to predict.Teams like PSG,Juve and Real are inferior to us,but if we play a shit match(like Celta or the Bilbao one),it will be impossible to turn it around.But even if we play like we can,no one can guarantee that we are going to beat these teams and especially Bayern.
TL;DR This is our best chance to win the treble.If we continue playing like this(and improve a little bit) i can't see us losing Liga and the Copa.But CL is going to be tough regardless