Doctors aren't the ones making these decisions - hospital administrators generally are choosing what to invest in. Most MDs I know are excited about research and not necessarily afraid entertaining some amount of change.
People sue doctors, too, but I'd put money on the proposition they'll be more willing to sue a company than the individual they met who seemed like he had their best interests at heart.
Most doctors don't work in hospitals, they work in family practices and most definitely are making the decisions about how their practices operate. Most of us don't go to hospitals to see our doctors, we go our doctors private office.
They have more data than most other networks, and more resources to invest in R&D.
Specialists still seem to work from private offices, but my experience is that most doctors work for large medical groups where they do not make the technology decisions.