I don't think the question is that simple. I'd rather have him do what he does rather than be in today's terrible Hollywood blockbusters... depends what it is...
If it´s the right movie, then sure!
It would be great marketing to get his face out there in a quality theatrical release.
But it can´t just be any Rapper-turned-actor-and-wants-to-make-a-generic-actionmovie-shitfest. It has to be good.
And only once in a while so that people don´t start thinking of him as a bit actor. Cause he ain´t no bit actor. He´s a leading man. He´s Dolph fckng Lundgren!