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PCs are expensive, prone to failure, easy to break and magnets for viruses and malware.

The claim that super tablets would improve on those aspects doesn't sound very realistic to me. If tablet hardware is equally powerful as PC hardware, but has to be lightweight and run on a battery, it will be more expensive. A stationary PC is also less likely to break than a portable tablet of equal build quality.

How prone a machine is to viruses and malware depends on a lot of factors, such as OS, obscurity of the platform, level of clue from both the admins and the users etc. None of those factors are related to the hardware: if a tablet OS is easier to secure and still flexible enough for the users to get their job done, why not install a tablet OS on PC hardware?

The only advantage of a super tablet over a laptop is the form factor: it is easier to carry around. That can be important in some companies. But it will cost extra, not less.