In the age of ADS-B, where pretty well every commercial aircraft on the runway broadcasts its velocity twice every second and acceleration can be readily derived, I'm surprised that the possibility of an externally-monitored safety-net isn't being considered.
AFAIK update rate is one per second.
Don't think ADS-B is a solution for impropper performance calculations. ADS-B relies on GS (time delay!), performance on airspeed.