We need a UART with RS485 TXEN, an SSP/SPI, one ADC channel, at least four PWM channels, and at least twelve additional GPIOs in a package that's similar in size to the QFN32 that the LPC1313FHN33 comes in. We don't expect a drop-in replacement (though that would have been super) but it seems multiple entire families of parts were axed without offering much in the way of a migration path.