I don't think the Mana forum and/or its more prominent members (current or ex) could have a make-or-break influence on the company.
First of all, what counts is the quality of the product. I think that it is fair to say that in many systems, the Mana effect was experienced as positive, in others not. So what, no stand can be a panacea, but it was obviously a viable product, competitive in the marketplace, or it wouldn't have sold in what appear to be good numbers until today.
Of at least equal importance is the marketing. Mana started out with a distinct disadvantage over practically all its rivals in that it is modular only to a degree: the amp stands, particularly the 5 and 6-tier ones, are cumbersome beasts and must be practically impossible to send over large distances, at least not economically.
Compare that to products like Hutter, Quadraspire or Fraim, designed from the outset to be easily knocked down and transported, and they are much more standardized than Mana is.
Plus: if you add a component to your system and you have Fraim or any other modular product, you buy another shelf. With Mana, you order a new stand from the factory and sell your old stand on the used market. Not a proposition that many people will find attractive.
The appearance of the product (Gothic lettering on the logo and everything) and the image the proprietor projects in his personal demeanour are also larger factors in Mana's stance in the marketplace than they appear to be with other products. I suspect there will be a market saturation point for people who are attracted by appearance and image. The logo change came at a time when it made little impact in the market.
Finally, Mana has not AFAICT marketed itself to the AV/home installation market, which is where the growth has been mostly in the last few years.
Other companies have compensated for the decline of the home market by increasing their exports, but the transportation costs weigh heavily against Mana in this respect and make substantial sales outside the UK difficult, I'd guess.
So, if Mana is in trouble, it will be a combination of factors at work, some to do with the product, others with the company, still others with the market in general.