Travel is the huge issue. We are very isolated here in the northwest.
IMO there would need to be several regional NASL teams, like maybe Northern California, Oregon, Washington, Vancouver, Kelowna, Edmonton and Calgary for it to be feasible.
Travel across the continent or even Canada is a no go. Busing from Victoria to Ottawa takes like four days and costs thousands. Its way too expensive and too hard on the players.
Look at the now defunct Abbotsford Heat who tried to make a go of it in the American Hockey League, which primarily has teams in the eastern US. The Salmon Kings folded and were replaced with a WHL team that has better travel and doesn't have to pay player salaries.
The PDL Northwest Division is almost ideal with rival teams from Washington, Oregon and Vancouver.