Sorry Stan, I will explain a bit for you.
For a start, in my experience this is a very unlikely scenario. The type your friend was flying may have this as a possibility, but a modern transport aircraft would not get certified if there was a fault which could lead to the simultaneous failure of all power generation on the take off roll. Maybe this was a 'what if' scenaio.
On my current type, I would consider it so unlikely as to be inconsiderable (if you follow my drift). But if it were to happen, there would be a gap of up to about seven seconds before the hydraullic powered emergency generator kicks in and then you will be in the emergency electrical configuration in which you can continue flying so long as you have fuel - albeit with with much reduced services. Flight on batteries would only happen until you lowered the gear and then on only some of the older airfarmes. Now if this were to happen on the take off roll, I would consider that a proabale cause for stopping. It's a major failure. I would have braking from the emergency accumulator to a maximum of 1000psi, which is fine for stopping in most circumstances. Rudder and assymetric braking would keep me straight. But if it was a VMC day on a very short runway I would consider getting airborne and relying on the emergency generator. (You did specify a double generator failure rather than an even more unlikely scenario of complete electrical failure).
All my other types have been 4 engine aircraft with paralleled genarators split into 2 systems. A failure of all generators is even more unlikely. A tie bus fault could lead to the loss of two generators if the protection doesn't work and un-parrallel them before serious damage occurs. But loosing four? Very unlikely.