I think it depends on the other core values the LB has. Kas1007 always has a lightning fast DL to contend with in Yost, and turned me on to this for my teams. I won't do it in D1, but I usually have 1 LB that I will convert for my D2 and D1AA teams.
While not all become stars, some do and sometimes you can find find great alternatives if you find yourself late in recruiting needing a DL. You just need to make sure the guy had pretty good T and GI, since you'll lose a good chunk in those attributes during the transition.
Not a bad thing to experiment with on occasion.