I think there is need for caution in this debate about safety and longer runways.
The accpeted wisdom is that V1 is the point at which you must be able to stop - beyond that you are not going to whatever happens pretty much. You carry the probem into the air.
All operations will conform to that performance prameter.
If one considers operations from the LTN 26 intersections say with an A319 unsafe then that would probably make all smilar operations from Southend unsafe.
Or perhaps operating an A340-300 from Delhi on a hot (43 C) windless day unsafe.
In all these cases there may be insufficient distance to stop just past V1 but one can stop at V1.
If you want to be able stop all the way to rotation that would change the face of air transport opeations.