While this sucks for those still using 4.0 it was to be expected at some point. It was quicker than the 3.6 EOL notice though. But you're right, we will be seeing more of these. But if 4.1 fixes many 4.0 issues it makes sense to upgrade.
RIM is not the only company doing this. Hey its time to upgrade because we cant fix it, OOPS! the new version has bugs we cant fix until next version comes out.
Software SUCKS because, we humans, make mistakes!
Dont like mistakes, use an ABACUS
__________________
I had to fall
To lose it all
But in the end
It doesn't even matter