Now that I think about it on what caused the park it's downfall, M&D's problems weren't caused by a lack of potential visitors, but a lack of execution. From pictures that you could see of it from the air, it looks like it never really had the cash to pull off more than being a permanent stop for a travelling fair (unless you believe these stories that the owners were hording cash or were utterly incompetent in general). If there is any landscaping at all apart from some trees being behind fences or if you want to split hairs, include the crazy golf course theming.
There is no appearance of effort, at least not visibly but it just gives them the appearance of lazy owners who got what was coming for them. You can't help but think what a million pounds' worth of polish and shine could have done to the place. One flat ride on a concrete foundation, with a queue line and operator's booth under a solid roof, a little kiosk on the side in a themed building, and bushes sprinkled around to give it some greenery. Not asking for Europa Park-level theming, but something like Paulton's theming efforts would probably have been surely attainable.
Who knows if the London Park never gets off the ground, they can use a fraction of the resources on M&D's and while this would make their ambitions less grander, it would however a hell of a lot more plausible for them to open a 'new' park.
Yes, given the location they had with the catchment area and the current size of park and potential to expand on the site they had, M&D's should've been a much better park and thus had they kept the park's image to look positive, it would have actually made the park more desirable for punters to visit.
When you think about, the lack of execution is not only this park's downfall, however it is perhaps the fault of many closed theme parks in the UK who didn't seem to know how to market properly and thus led to their end. Who would be up for the idea of the London Park guys saying 'screw it' with that they'll never get planning permission and try to gain a monopoly on Scotland by taking the M&D's site?