Do you really think that Talgo cross their fingers, thrash their stock along at 200mph, and hope it stays on the track? Aside from
operator error, it does.
I think this represents a very blinkered attitude to innovation. Talgo developed their system as a broad gauge train and it only subsequently found a niche as a gauge changer. Variable gauge can also be done on traditional bogies so it is not like the need for such a capability would have led to the invention of Talgo.
For a while after BR research developed fast four wheeled freight wagons that stayed on the track it seemed that the bogie could be dispensed with in most applications (hello, pacer!). The German Aerospace institute is working on similar ideas with modern active mechatronics. It could well be in the more energy scarce future that the traditional rail bogie looks to railwaymen as an unbelievably heavy lump of ironmongery to drag about.