They should, by default, consider and support all versions, but something I don’t really like is when players that play 1.9 make opinions on a suggestion for the 1.8 version. It’s like voting when you wont be there later. So for a very long time, it’s only been eggwars and skywars. Not that those are bad, but they get boring. I started playing 1.9 because all my friends were, and I had a bigger variety of games. So there are a few things that can happen.It may be an argument, but let's say I don't really think it was a good one xd
Cubecraft is now mainly focussing on 1.9, they should consider all versions
A: Cubecraft can update 1.8 to have more games
B: Don’t do anything and let players leave
There are probably more things they can do, but those are the ones I was thinking of.
P.S Update to 1.13 is another option ;)