And we'd better solve it by the 22nd century, or we will have another reason not to entertain much hope for cities or, indeed, any kind of civilization a millennium hence. In the same way bad money drives out good, misinformation drives out information. Unless information is stabilized by a strong evaluative filter, such as science, with its controlled experiments and repeatable results, it gets swamped by simpler, stabler misinformation. If the people who design and run the Web don't develop reliable ways to evaluate and stabilize information, the Internet may become the agent of social chaos. As the pundits of the 26th century will constantly reiterate, while the store of accurate information is indeed being replaced, it is being replaced at nowhere near the rate at which it's being erased, forgotten, and eroded.
Genetic engineering is another of science fiction's favorite solutions to pretty much all problems.
If progress had left the world notably harsher than it is today, genetic dispositions from diabetes and osteoporosis to dyslexia and color blindness might have bred themselves out of the gene pool by now through natural selection. On the upside, however, our increased population and the greater ease of survival in developed countries means there's likely to be more random genetic advancement. The problem, of course, is how to tell which is which. Suppose, for example, that the rate of appearance of new genetic anomalies, good or bad, has been fixed by evolution at the optimum level for species survival and that either increasing or decreasing that number may be lethal for our species. Genetic engineering might give us circus rides with real unicorns and giraffes with wings, as well as new antibiotics produced by genetically engineered molds.