Gents, there is some misinformation here...
RRitch wrote "Consensus seems to be that the lawyers are standing in the way."
That would be the consensus of, frankly, uninformed guys posting to woodworking forums on the internet. Apologies (heck, I'm one too), but that is NOT authoritative. I had a friend over recently, he is a Senior Engineer for a tool company (that is not Emerson). Lawyers aren't the problem with SawStop at his company. I can't speak for him and it wouldn't be fair to be specific at all.
So speaking for myself, here's a different twist that's at least equally likely. It ain't Lawyers, it's Accountants. SawStop requires essentially an entire redesign of a tablesaw. Take a look around at the tablesaws on the market. How recently have ANY of them been redesigned. Other than the DeWalt 746 which is brand new, no one does complete overhauls. Very expensive. I don't know how many tablesaws RIDGID sells in a year. Let me pull a number out of the air (that's probably low), and guess a redesign would cost ten million dollars. How much will the price go up for Emerson Tool to see any reasonable return on that investment? That's a price difference that would be on top of the cost of SawStop itself.
If RIDGID (or anyone else) wanted to offer SawStop as an option, they would have to offer two entirely different machines.
"Dado blades are not legal in the UK"
This also is incorrect. Dado blades are perfectly legal in the United Kingdom. What is not allowed is to fit them to a tablesaw. What do they use them on? Radial Arm Saws.
Don't get me wrong, I think SawStop is the most innovative safety breakthrough ever (and my earlier cited friend and I fight about that

). I have communicated with Steve Gass, and told him that I hope he is immensely successful. Honestly, I do not think we will see SawStop on contractor's model saws for a long time. I'm hoping to be able to buy a cabinet saw with SawStop fitted some time, though...
Dave