To me, it depends on critic and subject. When it comes to music, i wouldn't care too much if they disappear all together. Young people get to know music not based on critic opinions but they are exposed to it, if interested, they build up their own opinion and i think it is relatively easy to navigate from there. Songs are short and listening to a piece of crap at the bar doesn't hurt too much. Radio, friends, etc. are a good source of information to discover new things.
Now when it comes to films..... the ration rubbish to decent movies is so high that i don't start watching anything that is not at least 70% in rotten tomatoes. Here critics are a necessary tool for me, i don't want to waste 30 minutes of my life (ok, sometimes 5 minutes is enough) trying random movies, and then, oh, it got too late to start watching a new one :-/ But are individual film critics mostly right? i guess they aren't, but that's why aggregators are the best invention since sliced bread.
PS: when i was a kid one used to read their favorite critics, that is, the ones that liked mostly what you liked, and that was enjoyable and useful, but i guess that reading a random critic out of roon or whatever other tool must be a different experience