Brandon is a next level DM, easily on par with Mercer. His voicework, improv, experience and enthusiasm for DnD is amazing. Hes been DMing for over 20 years, has run endless campaigns, and D20 has sold out venues like madison square gardens for shows. Hes got serious chops.
It will be different, it may be worse, but it may be better.
Probably have a few strokes, even.