SawStop has every right to defend its patents. That said, in some cases patent law has openings for other inventors to improve upon existing patents. Also defense of a patent has to prove that there wasn't already something similar already done. I am not a lawyer, and I don't know of SawStop's each individual patent, but what I have observed is, the bosch technology works completely different. Rather than using a strong spring and an electrical charge to force an aluminum break into the blade, and the motion of the blade brings the blade under the table. Where as the bosch uses a high powered piston that quick pushes the still spinning blade under the table.
Two areas where I see where SawStop could contest a patent. The first is the flesh sensing aspect itself. SawStop didn't invent that concept. The simple idea comes down to flesh coming in contact with a metal object that has a charge running through. The contact of the flesh causes a drop in the voltage. It is the same principle that touch lamps and other touch sensitive electronic devices have used for decades. The other area is the diagnostics both table saws run before allowing the saw to run. While it may seem innovative, that concept too has been around for a long time. Whenever you start your car, the airbag system runs one so that it won't deploy if there is a problem, preventing unwanted deployments. (Note, Bosch's technology is based on their airbag technology)
As I said, SawStop has every right to exercise their patents, but I don't think it is going to be an open and shut case that SawStop is hoping for. In fact I suspect their will be multiple verdicts in this case over the next several years.