This is something my whole team argues about after matches all the time. Nobody really knows for sure but there are some pretty good guesses out there. Stumbled upon this the other day https://joesdaily.com/entertainment/how-will-skins-change-in-counter-strike-2/ and it covers what might happen next pretty well. Valve has been slowly updating things since CS2 launched and skins are definitely part of that. Some people think collections will get bigger and others expect completely new ways to get them