Unlikely. Some of the past mental feats that are attributed to "see, we're getting dumber" are based on training instead of native capability. For example, memory training was important before widespread literacy, but now survives as a competitive sport and taxi drivers. Both the drivers and competitors make use of the part of the brain responsible for navigation and neuroscientists have actually proven that that region develops with use. (read up on the Method of Loci for more)

If anything I see our mental potential becoming "flabby" due to laziness and a lack of mental exercise - or worse, a devaluing of these skills because its not a "real job". Like ditch digging.