Even the chance is small for barcelona but we don't know what's gonna be the result from the barcelona against bayern. This must become a match that will determine the future for this club. Inter is having more points compared with barcelona but it seems like the match against bayern is a key to determine the future for this club.
The result of Inter vs Plzen should be the winning of Inter Milan. Very very small chance of Inter getting a loss or draw. We can see on the table that Plzen never won and got many conceded goals.
Barcelona vs Bayern Munich, the winning opportunity may be 50:50. But considering the current performance of Barcelona, I am pessimistic that Barcelona can win this match, especially if Bayern Munich play with all their key players. The very possible result is a draw, I guess the final score maybe 2-2.
So, expecting Barcelona to qualify for the next stage, seems hard to happen. Even Xavi already stated that the current Barcelona squad looks not suitable to compete in UCL. Xavi realizes that the current Barcelona squad isn't strong enough for international competition. They seem to focus on La Liga competition since it is more realistic to achive.
Barcelona's chances of qualifying from the group stage are very slim. as we know, that Inter has a greater chance of advancing to the next round with Bayern Munich.
Inter-Plzen match, as we are aware, it is very difficult for Vitoria Plzen to match Inter in this match, let alone to win the fight. the only way for Barcelona is to win the match against Bayern at Camp Nou, but as you can predict the chances of winning are probably 50:50. however, it looks like we have to first look at the starting eleven of the two teams.
but as you said, the hope for Barcelona to qualify for the next phase seems very difficult to happen. except, Inter stumbled in their last two matches.
but it seems that will not happen, enough for Inter to hold a draw against Bayern later.