When I used to go to Field Mill in the 1980s (when they were a half decent 3rd tier outfit) their main stand put anything we had to shame, but even then they had one whole side not in use and it's now 34 years since they last survived in the 3rd tier.
I don't dislike Stags, but as with Wrexham it's a loss to us if they go up in terms of having the big fixtures and results to look out for. There's the argument that losing those two will make it an easier division to climb out of but there's something to be said I think for having certain clubs to go up against that spur you on. The sense of being left behind is not a positive one, as we found out with Fword.