Beginning in 2024, workers will be allowed to contribute up to $23,000 to their 401(k), an increase of $500 from this year. The increase applies to other retirement savings accounts, including the 403(b) plan, most 457 plans and the federal government's Thrift Savings Plan.
So? You asked about "how many people" can afford it. I've proven that 50% of American households could afford it if they really wanted to, and the fact that that 50% apparently doesn't include you is immaterial.
America is an enormous country. Not all states, regions, and counties are the same. I make close to, but not quite, the median income for my state. And I work two jobs. One full time and another part time. That may be immaterial to you but it isn't for a lot of people.