I think when people talk about clubs being "ready" for SL they miss out on the one obvious factor that has the most influence on them being "ready" - the massive windfall of Sky money they get.
I suspect it has been a massive source of frustration for Mark Campbell over the years having to watch clubs like Fev's neighbours Wakefield and one or two others in SL, as I'm sure he must feel that the only major difference between them and Fev is possession of a SL place and that priceless bundle of Sky money each year. Fev play in a stadium which they own, have some revenue streams as a result, have an off-field structure that is probably already better than that of some existing SL clubs, and have actually played host to Wakefield as a training venue for many years, but it's harder for a club that doesn't have a sugar-daddy type backing to make that onfield step these days to get into SL.
This isn't a dig at Wakefield btw, they have done especially well in recent years to consolidate their SL position, but if the positions had been reversed a few years ago I think Wakefield would have found it even harder to get out of the Championship under the current funding conditions. But far from not wanting SL, I suspect that it's that goal that has been driving Mark Campbell to invest so much over the years.