Zerouali,
Yeah, but V1 would have been calculated for the runway, not the taxiway....
Take some language considerations, disbelief and reaction time and an ill-timed abort could have been a wrecked aircraft and large body count instead of just a lot of red faces and lost face!!
Fact is a high-speed abort in a large jet is one of the riskiest manoeuvres there is. Once at speed the best place to be is in the air, and, as such, I agree that the best thing ATC could have done was watch and hope.
The fact that this major blunder resulted in zero casualties has to point to this being the correct (In)action!