That still doesn't change the fact this is ALL speculation.
Yep, it is speculation, so we'll have to see what happens.
But I would point out that the Chinese Navy have already decided that a smaller carrier (primarily for drones?) with an electromagnetic catapult makes sense.
Maybe instead of building super aircraft carriers the Chinese will build anti-ship fractional orbital bombardment rockets. Imagine a space rocket that can orbit the Earth, fall out of orbit above an enemy target, and strike precisely on the deck of a moving ship trying to evade.
Nobody has a monopoly on the future. My idea is equally valid as your 150,000 ton carrier.
A 150k ton "megacarrier" would be a scaled up version of a 100k ton supercarrier, with dimensions some 15%? larger in terms of length x width x height. That is an evolutionary change and well within the bounds of current engineering.
In comparison, an anti-ship fractional orbital bombardment rocket is a step change and would require the development of entirely new materials and technology - which may or may not be possible.
The two concepts simply do not have the same level of validity.