Note that does not require a new pitot design, simply monitoring the voltage and current. Obviously trials would be needed to see how far the temperature of a pitot experiencing high-altitude icing differs from that during extremes of normal operation.
Described monitoring is task of the installed Probe Heat Computer (3x)
I realize these probes failed (iced up) more on A. than other A/C recently, while there only few suppliers (also GOODRICH had problems on these A/C).
The same design was used from launch to let say 10 years of operation without -major- problems.
So what is changed? Environmental issues, seeking the limits due operational demand, lack of training or taking more risk because sophisticated weather radar is installed nowadays?