Why stop flying the type? There is no evidence for this (yet).
From some of the info now available, it is looking that the #2 reverser deployed.
This idea fits with the following details:
* Low airspeed (Vr, maybe V2 if he's lucky)
* Apparently no fire/explosion evident in CCTV footage
* Aircraft crashed to the right almost immediately after takeoff
* Detached reverser found in fully deployed position on ground
Couple the low airspeed with yaw to the right induced by full forward thrust on the port engine, full reverse thrust on the starboard engine, and insufficient control authority coupled with decreasing airspeed and subsequent stall, and it's not looking good at all.
Given the above, they had little time to do anything.
ECAM Actions.