It is oversimplistic to say that since the CAA will stick to the current rules, there is nothing for pilots to worry about.
Pressure (particularly from low-cost operators) is intense. Simpson has caved in to a lot from operators already.
When UK airlines are operating at a financial disadvantage to other European airlines, they will squawk loud and long about wanting a "level playing field", meaning to be permitted to overwork their staff as much as the others do. Then sit back and watch the politicians cave in with BALPA and the CAA on one side and the operators on the other.
Furthermore, as you will already be aware, on the road you are more in danger from "the other idiot" then you are from your own driving. (This, at least, is most drivers' perception!
). The same is very true in aviation. It doesn't matter how well-rested you are if the other guy is falling asleep at the controls, doesn't hear "Hold Position" from ATC and enters the runway ahead of you just as you are rolling.