Christian Horner had this to say :
"It would all depend on (Schumacher's) motivation and if the timing was right," he said, adding that it's a "difficult question to answer."Its not surprising that if a team is interested in MS. Ron Dennis had famously remarked during the late 90's that he didn't need a MS, because his cars were faster. However, I'm sure he wouldn't have said "no" to MS, had he been interested.
Hate him or love him, one must give him credit for what he has achieved. 7 World Championships isn't exactly a walk in the park. With the change in rules for 2008, every team starts afresh in the engine department. It would be really foolish to write off MS or Ferrari.