Improving haptic feedback is a good idea, as the current attempts simply don't feel realistic. However, doctors feeling tumours? Why? That's a sophisticated audience; people who have trained, through qualifications and experience, to understand tumours through imaging. Yes, scrolling through a CT scan with a mouse wheel isn't realistic, but they've learnt to accommodate.
On the other hand, the masses using touchscreen, that's an open market. Maybe it's a worthwhile one, maybe it's not. But that's the market to try. Otherwise it's like selling finger-friendly guitars. The professionals have adapted their fingers to the current steel--calluses and all. It's the beginners you want to target.