Don't forget dark energy, also (like dark matter) invented to fit the observations. How many hundreds of $millions of taxpayer money will be spent searching for it? These inventions are keeping many scientists employed, it seems. If they went back to correct the mistakes (like any good software developer) there might be a mass layoff.
Just imagine the fame a researcher or a team would get should they explain dark matter by updating current theories (in a way that fits _all_other_explained_ observations). I don't think if anybody had a good idea they would care about mass layoffs.
But the people who'd review the idea would care about that, so they might refuse to review it as "too nutty". Plate tectonics might have fit into that category, although of course it did reach general acceptance when the evidence became overwhelming.
