Re: As a Service?
Most home users consider their OS to be a service anyway, really. And in reality, consumers treat their devices as services also. They buy them, use them for a period of a couple of years and then replace with a new one.
So, practically, there won't be that much of a difference to most consumers that I've come across. Many have already happily made the move over to Office 365 subscriptions from full Office boxed editions.