Thing is..Beezer was excellent in the 99 Playoffs for the Flyers. He had a 1.46 GAA. in 6 games. The team just couldnt score for him.
Then by 2000, Brian Boucher took over for Beezer and was fantastic all the way up to Game 7 of the Eastern Conference Finals. He could not have played any better. The Lindros injury debacle ultimately derailed the 99-00 team. They were up 3-1 in the ECF when the rumors of his return began..they dropped the next 3 with Lindros playing in the final 2 games (and well I might add..but the team lost its chemistry).
Then in 01, Boucher regressed but Cechmanek came along and was one of the best goalies in the league for 3 seasons..nearly topping Hasek for a Vezina.
In 2004 Robert Esche took over and was once again great in net with the Flyers going to Game 7 of the ECF yet again despite a decimated blueline in the Playoffs.
Long story short, CuJo wouldnt have gotten them over the top IMO because goaltending wasnt the reason they didnt win it all. The revolving door of netminders created a false narrative that they werent getting good goaltending.
A prime CuJo in 2010 = Cup though