The reasons are simple, the ISS parts are already old and could stop working properly in a short time.
Russia, for example, has already extended its concern about the damage that a possible failure could cause and warned that obsolete equipment would cause something irreparable. So, it is inevitable that the time of this machine has come to an end.
On the other hand, giving way to private companies to help finance a new station would give the space agency the opportunity to save and use that money for more research.
As it is done with cars, the station will be towed towards us. By removing electrical power, the base will change orbit to be caught by Earth's gravity and subsequently fall.
At this point, the station will already be secured by a tugboat so that it can be directed to Point Nemo, an area considered the furthest from the town so that it does not represent any danger.
So the ocean will be the resting place of this great space base that has helped in thousands of investigations to understand the Universe.
