The squeeze kernel is unfortunately missing support for a lot of
current hardware (notably graphics but also some networking chips) so
many people are running later kernel versions. I would love to fix
some of these but I have my hands full and I can rarely test
backported drivers myself. So I would expect quite a lot of people
to be running Linux 3.2 from wheezy or squeeze-backports, or a custom
3.x kernel (which doesn't require a huge amount of technical
sophistication).
I don't know how many people use 'crash'; you're in a better position
to answer that.
I think that rather more than one or two users will be affected by
this, and if there is a simple fix then it is fair to expect that
you will save them the trouble.