Yeah, kind of think the small size of Switzerland, the fact that 58% is mountainous and it has 348 ski resorts in country of 41,285 km² has more to do with it than USA ski school monopolies.
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Similar story for Austria. 60% mountainous, 437 resorts, 83,879 km².
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Whereas USA is 9.834 million km² and has a mere 527 ski resorts.
But really, so many people here agree with your main point. You are (mostly) preaching to the choir.
If you wish to change the current situation then there's possibly a few more fruitful activities that could be pursued:
1. Write angry letters to major daily newspapers
2. Form a lobby group and lobby relevant state and federal legislatures
3. Foment revolution to overthrow the entire imperialist, capitalist regime and, once having gained supreme executive power, issue a proclamation outlawing the local monopolistic ski school practices of resorts. If you are going to all that trouble could you also fix a few other possibly more important items?