The comment
"We'll be seeing a lot more passenger injuries" might have been in relation to wake turbulence, but it might also have been in regard to mis-handled high altitude TCAS RAs.
The following questions are purely rhetorical.
- When was the last time you hand-flew at 39,000 feet?
- How much of an adrenalin rush do you get when the TCAS aurals start going off?
- How many seconds "reaction time" (ie before you make a control input) are assumed in TCAS RA calculations?
- What change in g should you use to fly a TCAS RA?
- What does a change in g of that magnitude feel like in the seat of your pants? (since most airliner cockpits don't have a G-meter
)
- What should passengers perceive during a properly-flown TCAS RA?
In my opinion it is imperative that crews do whatever is necessary to ensure that their rate of climb or descent is at a suitably low value when approaching all cleared levels in order to avoid unnecessary TCAS RAs.