Although if he weren't limiting himself to cheese only, I think he could do pretty well on pizza alone
As someone who also has to deal with - I guess, "sensitive" blood sugar - but nothing as extreme as passing out while driving - his problem is probably more from the simple carbohydrates of the crust than anything else. However, especially if he started making it by hand or started eating whole-grain crust pizza, I suppose his problem could be somewhat ameliorated.
As for whether or not pizza can get old, I don't know. I don't get the love some people have for pizza. I could take it or leave it, really. Admittedly, I would like to try and make my own from scratch, I think that would be fun.