We have to be very clear about this, this is never going to happen, and if the bitcoin core developers were dumb enough to do or try to do something like this I can assure you that someone will fork the core of bitcoin immediately and from that point on that will probably be considered to be the true bitcoin.

I know there are a lot of people that care about the environment and that do not like the energy consumption of bitcoin, but those people know nothing about the technology behind it and how it is by far the most efficient system that we have in place, it is way more efficient than the banking system that we have in place, so if that is the reason you are asking then don't worry since all of those people do not really know what they're talking about.