Mmmm....I dunno, man. The Spruce Goose never did any proof-of-concept troop hauling. It got up off the water, made some scary creaking noises and never left ground effect. Power-to-weight, the thing is a 747-800. Size-wise, the thing is a 747-800 and a half. But there, where most planes have a fuselage, Stratolaunch has a stress concentrator. And it's carbon. Which means nondestructive testing is super-duper tricky and any delamination and it's done. Rutan's a clever guy. But if you recall, the last big scary cargo beastie he built scraped its winglets off on takeoff and the closest he's ever gotten to a production aircraft is the Beechcraft Starship. ...and he retired in 2011 so this is his posse, not him.
All points more valid that my idle speculation. My thought is anyone who has enough money to build this but never use it has enough money to fire a rocket or two into orbit. And maybe the sci-fi geek in me is just secretly hoping they do.