It's only existed since 2015, I'm pretty sure most of us were fine without it. People are worried about it ending when before 2015 we didn't even care or even noticed if certain sites were slowed down. By the way it still has to pass through congress trump and the supreme court before it has a chance to be removed. People will make protests and they'll veto the repeal in 2 days.
Actually, it doesn't have to pass through congress - its a regulation, not legislation: https://www.inverse.com/article/39444-does-net-neutrality-have-to-go-through-congress-not-exactly and there is not a huge basis for a legal case afaik the reason it existed was because ISPs sued the FCC for enforcing Net Neutrality. The court said that the FCC couldn't regulate in that way if the ISPs were under Title I (pre 2015), but they could if the ISPs were classified under Title II, so they reclassified ISPs. that's essentially what was repealed a few days ago. ISPs will soon have the ability to make these fast lanes, throttling etc because the FCC will have reduced ability to regulate due to the Title I classification, the difference is that the ISPs know the FCC can't regulate effectively. https://en.wikipedia.org/wiki/Verizon_Communications_Inc._v._FCC_(2014) People protested before, did that stop the FCC? There's too much money in this, and too much lobbying going on.