I think the real question is how long will it take a side load? No doubt a standard BB will take side load- to a limited degree- but what the life of said bearing will be? Well, that's another story. There's a reason your typical, older automobile uses tapered roller bearing on the wheels; these will accomdate both radial and side loading- and both loads will have a high limit.

Regardless, good discussion that brings up some good questions.