Most of the old famous ICs and microprocessors are still being made. Not so with power transistors of various sorts; they pass into oblivion rather quickly.
The newer micropower components by Microchip are damned impressive. Quiescent currents of a few microamps for quad comparators, and around 20 uA for a 5V op amp with 100K bandwidth. Others have them too, some are rail to rail inputs and outputs as well. Analog has never been better.
The range of applications for MOSFETs keeps getting bigger too, several manufacturers now provide full SOA data (safe operating area) for linear operation. I converted my linear PV charge regulator over to MOSFETs instead of Darlington Bipolars last year...by luck of design, no circuit changes were needed but the power requirements dropped substantially, and the capacity increased nicely as well.
Alas, wildfire smoke has me laid low, health wise, so projects are on hold.