I know what you mean about bootstrap. On the other hand, nobody I know would have any idea what it is. One of my friends the other day who wants to do a startup had no idea what Wordpress is. I had to pretend not to be completely floored, lest I insult him.

If the blog will be targeted towards more savvy tech folk like yourself, then I kinda see your point. If it's not going to speak to that niche then I say go forth with bootstrap!

edit: and I'm sure he'll customize as he goes.