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.
Yes this is very true that higher electricity rate miners will be the first to shut down their rigs. Just like the last bust cycle, I am sure there were miners with under $0.04 electricity rates that continued on while making some small profits. However for people who were paying much more that $0.06 there were stretches of time where it was at best break-even. Of course people then resort to rationalization, such as well my miners are also heating up my space so the electricity bill is really for heat and mining is a bonus. While there may be some truth to that, when things are starting to get that tight in terms of mining profits you know the game is about up.