If it ever happens, it will be a long way away.
PADI has said "never" many times and later changed its mind, but I don't see it here. Swimming against the tide (nitrox) or being shut out from a lucrative market (tec diving) is one thing. Being able to teach one extra speciality? Just not enough upside.
PADI isn't shut out of the Tec Market. They have their DSAT programs -> Course - Discover Tec