The Playtrix Christmas server which is the only one that is well visited is not really interesting for owners of the full version because cups with only 3 tracks which always are the same has not the same fun like cups in 0.86 with 16 players and many funny tracks.
Concerning the 0.86 there still are players but also now only the half than there were before. As they do not like the new version or unfortunately do not want to pay for that I hope you do not turn off the 0.86 servers because then these players will be gone.
I hope you do something to solve this situation if it doesn't change within the next time. Maybe you consider other restrictions for players who did not buy the licence (like only have one color, not able to use the track editor, etc.). But if they only can race 3 tracks this also limits the possibilities of players who paid for the game, because they still can only race against opponents in the demo server unless there are not more registered players.

