if visual studio was usable with 10.000 files in 25 projects that would be great.
which it is not.
do i really want to add 10.000 test cases to that?
quite frankly, i don't.
i'm happy if it doesn't crash on my team with funny '?' exceptions every day...
maybe the 'team system' really is a great thing - but until the studio isn't much more stable than it is today, i'm certainly not going to move any more jobs/projects to it. and certainly not 10 thousands of it.