The stock answer is that such jobs will either need to raise their wages until they attract labor, be automated, or cease to exist.

In my (laymans) understanding of economics, increasing all these wages will increase prices of things those people consume too, which will basically result in a marginally change.

> And who will scrub the toilets

People will be paid to scrub the toilets. (The effect on wages would be interesting: unskilled but dead-end jobs would probably see substantial wage increases, while entry-level jobs with advancement potential might see decreases, at least relative to wages overall.)