Now THERE'S a thought! I'm sure he wouldn't stay home as much, but when he WAS home he'd certainly be digesting lotsa info on the computer, w/o even having to step out for the morning paper! Yessiree, Holmesie would find it handy alright.
But the one who'd REALLY love the net would be Mycroft, 'specially since he sits around at home all the time solving mysteries anyway! It'd probably spare him the unnecessary labor of walking across the room. *L*
Oh yeah, and Dr. Watson! He'd have way less trouble keeping in touch with his patients, whenever Mrs. Hudson isn't online downloading SECRET stuff................