A price increase of 20-30% may not effect how you use taxis, but it will effect how lots of other people use taxis, and because loads less people will use taxis at 20% more they won't need to charge 20% more, they'll need to charge 20% + their decrease in utilization. Suddenly you're in a death spiral where they can't charge enough to make a living at any price.

I doubt this. Initially when Uber arrived there was no regulation around here - the prices were ~30% lower and people driving Uber were actual part time drivers with clunky old cars - this was the ideal Uber time for me because in my smaller hometown I could get a ride almost instantly in any part of the city and I didn't care about ride quality if I didn't get dirty or smelt bad after I left the car. After taxi protests the government stepped in to basically enforce rules where part time driving became really hard - you have to have a car newer than 5 years, need to have some sort of work contract - not necessarily with Uber but a lot of forms of started small companies that then partner with Uber - but you no longer had limited taxi licenses - anyone can get a car and setup Uber. This resulted in prices eventually rising by 30-50% depending on the city, more importantly it resulted in lower availability in smaller places because it blocked small part time drivers. At this point local taxi companies are still complaining but there are now taxi services cheaper than uber depending on mileage. So in a way this Uber market transformation already happened.

Like even at current prices an average taxi ride is 2-3x cheaper than it would be 10 years ago when it was basically a government granted cartel. And you were at the mercy of the driver randomly quoting you whatever he though you would pay in a lot of situations. Uber brought a lot of consistency and availability to the market.