In my opinion it has to do with the consultant involved in building the managementsystem. Make it small, make it usable and make it profitable and make the client believe in the use of it. If you can do that, you won't fail.
Vincent
This sounds as though you're laying the blame of all/most failures at the feet of consultants! Now, there are certainly some self-styled 'consultants' around who aren't worthy of the title, alas. And yes, they've caused much damage. But as with any supplier - caveat emptor also applies. Companies must do their own due diligence to select a good consultant, as they would any other supplier.
And yes, I'm all in favour of simple and practical systems, and on the whole find that the benefits of such systems speak for themselves. But I do not believe the consultant's role is to 'make the client believe in the use of it'. As the Standard itself says, adopting the Standard is a strategic decision of the organisation. If their exec management hasn't already got a good reason or two for seeking it, they'll almost certainly fail with a consultant or without.
As a consultant, I of course aim to have my client discover/realise (if they need to) that the Standard is all pretty much basic good business sense and I coach them in understanding it with this aim in mind. But any management wanting or expecting a consultant to convince them to 'believe' in their very own business management system, is seriously and sadly misguided.