I disagree with the premise that somehow now all startups and small business would like to do their own webdesign simply because LLMs can help with some of the process, same goes for the rest of your points.
Those business won't disappear, but instead they'll be able to make more with less, just like in the past when automation been improved. People don't suddenly get fired, but instead pick up new skills and can suddenly do much more.
The dream was always that we could automate humanity enough so we can all have more free-time, but turns out that just have the same amount of free-time as before but now we're pushed to do even more in less time.