No, this will definitely hammer a nail in the forehead of any Interceptor builds, at least as far as tourney builds. They were already non-viable in that format because there were such hard counters available (esp named YTs), and this will crush those few that could run with even poor levels of success. Being able to apply a stress, on demand, is far too big a deal. A "bit" tougher would have to be on the order of 3 shields, just to survive the turn they lose their actions due to stress.
The least expensive Interceptor with any reasonable effectiveness was the Saber+PtL, for 24 points. With a single 2 point upgrade, any torpedo carrying ship can now murder it. Yes, yes you still have to get it in arc, but that really isn't that hard if you have played for any length of time, especially on the first pass. Dutch + anyone, Red, Dagger, any named X, or Y wing. Ouch.
What you might see is the occasional Alpha squadron, or perhaps Avengers, but paying 30 points for Soontir Fel when he is so terribly vulnerable is not going to be a route towards a consistent competitive build.
JMO, but at 3 hull with no shields you just cannot justify spending 20+ points for an Interceptor when turrets and now Flechettes can make their maneuvering/actions so ineffective.
Then again, maybe one of the other upgrades will salvage the Interceptors. We will see.