Re: Can they do something more useful instead?
Never had winter tyres so genuine question - how hard is it to change from summer to winter tyres? Is it basically the same as having four spare wheels but with the other type of tyres? Would this be practical for a lot of motorists especially if winter tyres are only needed for four days every ten years or so (thinking of those without garages)? Although I understand where you are coming from would most people be prepared to pay this cost for the very small amount of time the winter tyres would be used?
As for weather warnings, isn't a warning only a percentage chance of bad weather, i.e. not an indication of the severity? You could be in a red warning area and see nothing at all while someone in a yellow warning area gets hit by frozen rain resulting in far more treacherous conditions.