The final result is good for Milan, but terrible for betters - I highly doubt that anyone was betting on Milan going to the next stage, and not on Milan simply winning in regular time. Due to this result, a lot of bets (and multibets) burned out. Genoa did not get anything in the end, but maybe the result of regular time will give them confidence and help them in the fight to get out of the relegation zone.
Of course, it was logical to assume that Milan would win in regular time, and for those who made bets, the match turned out to be unsuccessful. But there are positive moments in this match, I can say that the game shows that the team wants Sheva to be a coach and you are right, a draw with Milan can add confidence to the players. Frankly, few people believed that Genoa could beat Milan. Maybe Sheva will get a few more matches as an extra chance.
That would be good. I don't really see much reason to sack Shevchenko - Milan are in second place in Serie A with a good chance of winning the title. The failure in the Champions League is quite understandable, they had a very difficult group and sometimes such results (especially at such a short distance) happen even with top clubs.