. I do think that they will have to have one way traffic on the trails though to eliminate head on issues which cuuld get ugly if there gets to be significant uphill traffic.
Yes. I believe all the ski areas around here have designated uphill and downhill-only trails. And, importantly, also have designated hiking trails. All those designated trails, and hopefully more, should minimize the conflict that is the reason I oppose e-mtbs on non-motorized trails elsewhere.
How would it lengthen the season?
The lift-served MTB operating season is pretty short at most of the resorts in Colorado. Pretty much mid-June through Labor Day, with maybe an additional week or two on each end. There's at least a month if not more in the fall when mountain biking is excellent on the ski areas, but there are not enough visitors to justify running the lift(s). e-MTB's allows the use of all the fantastic trail infrastructure without the cost of running the lifts.
Copper Mountain, for example, just invested something like $10M into the Chondola that will be used for summer operations. They don't want to put the hours on that lift when few are using it during shoulder season. e-MTB's give folks the uphill without the cost of running the lift. The uphill is brutal at altitude even for fit visitors.
Same with the daily operating hours during the summer season. There is a lot of great mountain biking to be had in the morning and evening when the lift isn't running. I love doing a self-propelled ride at those time and I have the whole mountain pretty much to myself. I'm happy to share it with a few e-MTB's. There are plenty of trails to go around.