The last cycle definitely benefited the ultra-wealthy but you get into 30%+ drop territory and that absolutely hits main street IMO. It isn't like people don't have 401k's, IRA's, retirement accounts, taxable accounts. The upper middle/professional class would likely pull back on consumption if they had to take that type of hit and they're a huge part of the economy. That's a big reason I think fed would reverse course and cut if there was further weakening.
Since the bull went on so long, more wealth has been built up compared to say before the last downturn (350% market gain vs around 100%) so when you get a 30-40% pullback, it's just a lot more actual money being lost to the investor as well.
Either way, should be an eventful 2019.