It's more complicated than that. If a browser breaks Sharepoint or any other intranet site, it won't get deployed. I imagine there are many, many, many corporations who still haven't upgraded to IE7.

One possible solution is to identify as IE <= 7 to intranet sites (which can be designated via Group Policy) and IE >= 8 to non-intranet sites. Of course, this means admins have to properly define intranet/non-intranet, which means much rioting will ensue.

Poor IE team. You're getting screwed because management decided to rest on their laurels.