According to [0], TI were launching new graphic calculators with Z80s as late as 2016 - the TI-84 Plus CE-T Python edition (which is still available on Amazon UK[1][2]!)

Not a hugely compelling argument for "the z80 is still a popular microcontroller", mind.

[0] https://en.wikipedia.org/wiki/Comparison_of_Texas_Instrument...

[1] https://www.amazon.co.uk/Texas-Instruments-TI-84-CE-T-Python...

[2] Mild cheating going on though because it runs the Python on an ARM copro.