Eh, they could have put in a second lightning port, but that would be very un-Apple-like (this is the same company that refused to have 2-button mice for a while).
Also, it wouldn't have solved the real problem to add something back after they removed the jack. The issue wasn't just space, but interference between parts. Apple could have miniaturized the analog audio jack further, but the interference would have remained. Supporting analog audio was a losing battle from the beginning when blutooth and lightning both support digital audio output. If Apple could get away with it, they'd remove the lightning jack as well -- wireless power, audio, everything. In fact, I'm sure that's their ultimate goal. I expect the Iphone XII to be completely wireless -- though with a proprietary optical sensor/receiver to work with car stereos and beats audio, of course!