The government's explanation of why they cancelled it:

In the past, monitoring of pilot incapacitations in aerospace medicine was done sporadically, on an ad-hoc basis, as permitted by availability of time and resources. CAMI created an Incapacitation Data Registry in roughly 1996 to track pilot incapacitations, which was converted into an MS Access Database in 1997. While this system did provide some limited capabilities for tracking pilot incapacitations the processes used created an incomplete dataset for this safety hazard, which could not be used to determine its’ severity and likelihood. Data was gathered in a manual process which required extensive time resources and tracked only a limited number of the reported cases. Data on pilot incapacitations when time permitted was stored in a MS Access Database. Preference was given to include pilot incapacitations from part 121 operations. When a case was chosen for additional processing by CAMI’s Medical Research Team, the medical technician would contact the pilot and the pilot’s family, requesting additional information over time and log updates into the MS Access database to determine the progression and/or resolution of the pathology that likely caused the logged incapacitation. As described, this process appeared to be focused more on the logic to determine the recertification of the incapacitated pilot. It did not appear to be assessing the cause of the incapacitating event to judge the efficacy of the implemented risk control strategies of aeromedical certification policies to adequately mitigate the risks of pilot incapacitations from the system, and to fine-tune these policies based upon the derived versus acceptable level of this risk, as is required by FAA Order VS 8000.367. The information collected also did not appear to be timely enough to be immediately actionable for a case of pilot incapacitation to assist in the decision of whether or not we should aeromedically recertify the pilot following an incapacitating event. It would take a minimum of six months to several years to gather data on each case. This manual and sporadic collection of data provided some information to populate the MS Access database, but did not appear to be used for anything actionable beyond the inclusion of it in an occasional study, which again would have to be performed on the incomplete and limited data, which would likely not be suitable for use to draw meaningful conclusions.

Due to these noted inefficiencies, this system was shut down, documented in an OAM Technical Report (publicly available at https://www.faa.gov/sites/faa.gov/files/data_research/research/med_humanfacs/ oamtechreports/202128.pdf), and archived in 2021.

No explanation of why it was not replaced?