The EOL of P89V51RD2 is easy to understand, as signs are it was not really an 'in-house' effort anyway, just a legacy support one.

Harder to understand is the EOL of P89LPC98x/P89LPC97x, which are the quite new Wide supply parts, from NXP Asia.

The other narrow Vcc ones I can understand having lower numbers, which likely makes these new Wide Vcc ones just 'collateral damage'.
Funny part is NXP imagines their M0 can replace a P89LPC98x, but marketing 'forgets' the NXP M0 is not wide vcc.

Still, there are other brands they are helping here :
Someone else DOES make small package, wide Vcc MO's (even with partly 8051 flavour peripherals )

Link: Nuvoton Wide Vcc M0 M051 Series, Mini51 Series

and there are other 'LPC 51', with less porting effort :

Link: N79E855 / N79E854 / N79E853

Link: N79E845 / N79E844 / N79E843 / N79E8432

these N79E8x devices do have emulation board support, a clone of their M0 designs, which are cheap. [NuTiny-N79E85J]

and even Holtek have some good looking 8051 due soon..
http://www.holtek.com.tw/english/p...mcu_89.htm

and Megawin have some overlap with NXP
Link: Megawin Std 89C51 variants

Link: Megawin Full Speed USB 89C51 variants

and their newest USB variant, fills a Hole in the 8051+USB, with a part with good 64K Flash/4K RAM/12bADC/36MHz and a USB loader.
Link: Megawin Full Speed USB MG84FG516