I’m guessing the problem is last mile. There is a train from Denver that takes you directly to one mountain (Winter Park) but getting a train to any other mountain adds a ton of time and expense because you need shuttles from the train stop. The ski resorts are necessarily far apart (because they’re huge) and the time most people want to go is in the worst weather to be driving shuttles all over.
That Reno to Tahoe drive is still a hike and Heavenly/Squaw/Sierra at Tahoe are decently far apart.
I've actually taken this on existing infrastructure (Amtrak has a bus from Sacramento to South Lake Tahoe). The train to Sacramento from San Jose takes at least 3 hours and the bus takes another 3 (in winter weather). It's not terrible if you want to go to Heavenly but would be completely useless if you wanted to go anywhere else.
Also, last mile transportation in San Jose/SV, especially if you were carrying around skis would be a pain. Add in the fact that it costs $60 each way and it just isn't worth it. There used to be ski busses that did the route (and presumably would take you right to the slopes) but I have no idea if they still run. Those seem like a much better option.
That Reno to Tahoe drive is still a hike and Heavenly/Squaw/Sierra at Tahoe are decently far apart.