Dataminer Tez2 stated that Rockstar Games will end support for GTA Online on PlayStation 4 and Xbox One this summer. He noted that two weeks ago Rockstar announced service updates that could be related to the possible end of support for the game on last generation consoles.
It is important to say that this information should be taken with a degree of skepticism. The service updates may not be related at all to the ending of support for GTA Online on PlayStation 4 and Xbox One, which still have a large player base. What platform are you playing GTA Online on?