There are still plenty of miners who will snatch up your GPUs at a reduced cost because they have cheap power or are willing to stick it out. And the gaming market is much larger than the mining market, and gamers are always on the lookout for a bargain GPU.
Usually people mining is linked to electricity cost, so if electricity cost is the same within that region then if one stops mining cause is not profitable then all the other will likely follow and they will not buy gpu's, if profitable then all buy cards, if not then all sell cards. Within the US power cost is different so if one stops the other which is not where the electricity costs is high may not stop, so within the US is something, rest of world may or may not be the same, meaning if is not profitable, people will sell and nobody will buy.
The way things are, with roi getting higher and higher, right now is around 1 year and 6 months to break even, few months ago was 120 days.