Well it's not that simple. That means that the match would come to a conclusion which means qi is awarded, which we all know makes it easier for farmers so it's probably not possible, unless it still affects your ratio while no qi is awarded. It was done fine when there were qi transfers. Getting qi would raise your ratio and vice versa, but then there would be people farming their win ratio higher, if you can even call it farming.
tl;dr, there is no real solution.
There are many people that just leave the game / go to spectator mode when they are about to lose...
One had a blue belt and was rank 11!!!
Thats no fair gameplay, thats kind of cheating... everytime they would lose they just go to spec...
Solution: Cancel a fight (Going to spec, leave the game) = lose!
when i was a green belt i did that crap too and yeah this problem has to be removed