Yes, indeed many, because of that, Xabi also admitted that it will not be easy and they seem to need a miracle. And indeed as you said, Leverkusen so far also performs very well, beating Bayern Munich several times. However, here, Bayern Munich is really different this time and they seem very high motivated to win the UCL and continue to the QF round. But, yeah, we can still make some predictions again about the next match.
But as long as they still have the chance, they will struggle on it.
Source: Xabi Alonso
Unlike the previous season, Bayern Munich are very ready for this current one and that's why they're currently leading the Bundesliga table with 8 points and have also beaten them recently in the UEFA Champions League tournament, in the 1st leg of the knockout phase, it would be quite difficult for Leverkusen to qualify 3-0 down is a big scoreline and I wonder how they'll score Bayern Munich about 4 to 5 goals without any reply, it would be very difficult.But as long as they still have the chance, they will struggle on it.
Source: Xabi Alonso
That's why Xabi Alonso made that statement he knows they're already out of the tournament but would just hope for a miracle to occur to keep them going to the next round, despite Bayern Munich going over to home in few days time, I strongly believe that Bayern Munich would still be the favourites and win that match like they did in the 1st leg.