I've got a few black friends who weren't really fans of the OT (and lol at the Prequels) who are really digging what they've seen so far and are excited about the film because the guy holding the lightsaber in promos is black. They'll definitely be bummed if that turns out to be a red herring.
Han Solo is the best and most beloved Star Wars character and the dude wasn't force-sensitive. If that's Finn's role (the non-force-sensitive hero) then I'd expect people to be fine with that.
His set-up (the conscientious Stormtrooper defector) doesn't lend itself well to being a secret force user, and is a very strong character set up for a hero as-is.
They can't all be Jedis, and they tend to be more interesting if they're not.