There's no reason to do it. PoS is less secure.
The only advantages of using it would be power consumption but that's pushed by the green enthusiasts who don't understand that the power used to mine Bitcoin would be produced and sold anyway. If we stopped mining all around the world the power plants would not start to shut down because of no demand.
With PoS Bitcoin would lose an important feature and with it a lot of value.
If in fact I do not assure anything, I just wanted to know some points of view, I am a journalist and a big fan of cryptography that is why I present this publication to know the point of view of all, or at least of a majority with more experience than me . I still think we have to see how ETH and ADA are doing. Although assuming that they succeed does not mean that BTC will do it but it is a possibility.