Technically, most of Spider-Man Unlimited was on a version of Counter-Earth that was dominated by the High Evolutionary and his Beastials, not necessarily the future, even if Counter-Earth was more technologically advanced than regular Earth. That said, as one of those who actually liked Spider-Man Unlimited, I'd be down for Ben Reilly in a similar setting, too. Him as Counter-Earth's Spider-Man could give him a chance to stand out on his own, and given his past experiences, he'd be more acclimated to life on the run and in the shadows than Peter.