According to the French weather agency Meteo France the ski season gets one entire snowing month less since 1970 in the French Alps. In 2021, 186 ski resorts shut down against 414 still running in France. It seems to be happening all around the world
One the one hand, ski will remain. It will be increasingly north, increasingly expensive (rarer energy, higher in the mountains, fewer « viable » stations). A lot of current stations will have to evolve and go to other winter sports (hiking?) or die off.
On the other hand, we might regulate it all together and make it disappear as a policy to reduce our energy consumption (sobriety) and protect biodiversity.
In general, I think it won’t be a major concern in a few decades as we will focus more on things that we currently take for granted (food, water, energy, stable migration flows and peace). I think it’s a matter of time scale :)