I give a very small chance for Bayern Munich to surprise everyone by making a comeback from this bad situation for themselves. Because Manchester City seem very determined to make it to the title this season and this 3-0 advantage should be very helpful for them to qualify for the semi-finals as well. As long as they keep the same discipline in their game then there shouldn't be any problem.
PSG could have done the same to Bayern Munich already before but they couldn't. Because Galtier's system is just not working very well for them.