I highlight the final paragraph of the post by Mikeyt, much of which is fair comment.
The promotion are better to highlight potential difficulties earlier rather than later, and I totally agree on the "Newport" parallel -- having a club, a track, a speedway in any shape or form is better than not having one, probably ever again.
I have been to Plymouth twice, once under the old promotion (in the Conference League) and once last season. Great track, and much-tidied arena on the second visit. Hope they can keep going in PL, but if it needs to be back to NL in 2015, so be it. Better than nowt!