5% or 1 in 20 is quite a lot of computers.The Kepler discontinuation shouldn't have a big impact on the gaming population in general. According to the latest Steam Hardware & Software Survey, the total Kepler participation is less than 5%.
True but if you believed the article the old cards would no longer work with new titles.Killing off support doesn't mean the cards don't work any more. Kepler GPU's haven't gotten any real updates in ages even if they are supported by current drivers. This won't have any affect.
Besides bug fixes and performance improvements, updated drivers also usher in support of new games on the market. Since R470 is the last driver for Kepler, GTX 600-and 700-series graphics cards owners won't have access to subsequent titles that are launched after the release of the R470 driver.