Time to re"tire" Bridgestone?

This has been discussed a lot in the past, in the F1 community....why Ferrari (and Jordan...if anyone cares!) stick to the Bridgestone rubber when all other teams race with Michelin? The reason to raise this issue now is the double tragedy Schumi had to face in yesterday's Spanish GP...he was going great guns until then...strongly holding on the hard-earned second position...when one of those rear tires was damaged...he had to force his car into the pits to get it replaced...as if this wasn't enough, in the next lap the front tire deflated putting an early full stop on his race and on Ferrari's only hope, with barrichello struggling to get back into form...this is not the first time this has happened..tires have always been a problem area for ferrari, for many seasons...but the heroics of the ferrari crew have overshadowed the influences...but this season being not so good for ferrari, every little thing counts...and after this race, tires will be the front runners!