I've been getting back into biking these past several months, and currently have a nice-running, nearly bone-stock 1978 CB750K. I would like a cafe bike also, and may get/build one. But you know what......I guess I like these ol' CB750's for a reason that seems to be rejected by the market. I'm told someone (Kawasaki?) tried to market an all-round bike, and it failed. Folks want only special-purpose bikes. Cafe racer. Cruiser. Offroad. I like these old CB750's because they do it all. Freeways, dirt roads, short trips, long trips......
It's like choosing a wife. Sure, you can have something that performs amazingly in the bedroom (and who wouldn't appreciate that), but at some point you're going to want a nice home-cooked meal. Another time, you'll want to go camping. Lady Gaga isn't going to bait any hooks.