The new 'metered' Paradise access would seem to have serious limitations as a long-term solution to lack of winter parking.
One problem is that Longmire itself has parking for only a couple hundred vehicles. I have witnessed backups as long as three miles (Kautz Ck), just when drivers were physically required to show their chains.  All the folks milling around on the remaining lane can be a real safety hazard for outbound vehicles, let alone plows and emergency response. The 'new' Visitor Center substantially reduced the amount of parking at Paradise because of the building's footprint and the enhanced perimeter clearances for tour buses and emergency vehicles. Failure to use the old VC water & sewer lines to build a replacement winterized restroom at the lower lot have resulted in extra vehicle cruising & congestion.
I see basically three types of management approaches until prolonged economic collapse occurs ;o)
My preference would be First-come, first-served, until capacity reached, then hold vehicles at Nisqually Entrance, with programmable road signs at Elbe. I'm guessing the number of winter parking spaces at Paradise, Longmire and all park turnouts is less than 3000. This could be paired with optional shuttles and a small slice of capacity available for advance reservation.
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Reservation Only Entry Several popular parks are reportedly considering this change. It's hard to see how this could work for a sport as snow & avalanche-condition dependent as backcountry skiing. It would no doubt increase visiting costs and favor those who could afford multiple reservations. They should be required of tour buses in any system, though.
Mandatory Mass Transit would have the most associated problems for skiers, IMO. The primary potential for problems is simple logistics. The only places with enough parking for potentially thousands of visitors to transfer to mass transit would be either Ashford, or possibly plowing Cougar Rock Campground.  Many foggy, rainy winter weekdays probably see less than a hundred vehicles reach Paradise, so more than a couple buses would not be needed. At the other end of the spectrum, it's not hard to imagine many hundreds of people wanting to leave at closing time on a Holiday weekend. Ten empty buses might not be enough to prevent people waiting an hour for a bus to make the round trip. What happens to those folks waiting at Narada or if a late avalanche blocks the road?
'MMT' would also entail considerable additional expenses for the NPS. Paradise VC is currently open just weekends & holidays, so additional staff time would be required. I suspect bus stations require quite a bit more maintenance than museums. Rangers would need rigorous sign-out protocols to know when visitors had not returned, since there would be no vehicle to signal someone overdue. If Cougar Rock was plowed, the comfort stations there would probably need to be winterized and maintained.
From a personal perspective, MMT would degrade the Paradise skiing experience even more than the later average openings and relatively recent fixed closing time have.  I like to bring optional gear for unexpected conditions or changed objectives. I like to start or finish tours at unconventional locations (and unlikely bus stops) like Frog Heaven, Ricksecker, or Glacier Bridge.  I like rotating shuttle drivers to make the run to Narada down Devil's Dip a dozen times when deep snow makes trailbreaking hard. I like to have a dry change of clothes & shoes and a good vehicle heater close at the end of a powder day. I like to tailgate in the parking lot in good weather sometimes. It's hard to imagine any of that with mandatory mass-transit.Â
