Can the bitcoin PoW algorithm be changed? (PoS)

I have been writing in a long time.
There have been many trials in the coin market in the long winter of heavy snowfall and cold weather.
I was particularly suspicious of the controversy about Tether, but I could not avoid it either.

Anyway, on February 24th a few days ago, there is a big controversy in tweets.
What is the change of bitcoin POW.
It is the tweet of cobra who is the manager of https://bitcoin.org and the tweet that I exchanged with jihan-wu.

And cobra tweet again.

This is not cobra's sole opinion, but cobra retweets tweet of Luke Dashjr, the core developer of bitcoin.

And I put a public vote on my tweets.

As claimed by cobra and bitcoin 's core claims, the hash of the Bitmain Associative Mining Pool is actually over 50%.
(btc.com / antpool / btc.top)

However, if you go over 50% in the past, you may turn off the miner yourself or turn the hash over to the other side (BCH etc) for trusting the network (if you lose trust, the value of bitcoin may drop and the digger may become obsolete).
Maybe jihan-wu might be the one who created the BCH knowing that the current bitcoin takes the position of gold.

Interestingly, bitcoin's mining difficulty has steadily climbed irrespective of recent price declines.
In other words, the miner was kept on sale and the mining pool increased.

In particular, we can see that the difficulty in mining has increased sharply in December ~ January when price decline was severe.

So the mining profits of the miners

Although it has been reduced a lot, it still seems to be a profit section, but it seems to be in fact close to the last line.
Because the price of s9 antminer has risen, and the next mining difficulty is also going to rise.

The market situation for bitcoin, miner will be a fun watching point again for how long they will take the Maginot Line while damaging it.

Can the bitcoin pow algorithm be changed?
Please leave your comments.