Wait....why is software boxing a con? I've used it with my 2 pc setup and I love it. 0 Clutter on the desk (other than 2 keyboards and mice ;P), 0 high cost (20 bucks, equivalent to one dinner at Tio Pepe's with the girlfriend), etc.
If you mean because at some point software boxing could become against EULA while hardware wouldn't, I disagree, I think they'll allow all or none.
So, I'd remove the cons of software boxing, it's great.