Right. No way businesses are going to give up their PCs. What would they use instead? Tablets? There would be too many security risks. (well more than the NSA is creating now)
Don’t forget that tablets are not very ergonomic. As a person with many orthopedic issues, some unknown but most definitely showing themselves, I can attest to this. They would need to make equipment to make tablets truly nice to use at a desk. But they would still be too small.