Probably a good thing as from my understanding there is an uncertainty whether a version of CSGO will exist. For example there are some old patch versions available from circa ~2013 which are still playable.
Not sure if that will be possible after the move to CS2. You would think so, but at the very least, "Kisak-Strike: Gentoo Offensive" will exist.
I'm not sure I understand this point. Can't you still play CS:Source and CS 1.6? Why wouldn't CS:Go keep operating. It may not get as many content updates but the core game should be able to keep going as long as Valve keeps the game servers running.
Not sure if that will be possible after the move to CS2. You would think so, but at the very least, "Kisak-Strike: Gentoo Offensive" will exist.