Nike seems to think so, based on this: Nike Wants Athletes to Run a Marathon in Under Two Hours, So It’s Rebuilding the Race. And the Runners | WIRED
While it’s a bad idea to say it can’t happen, Runner’s World has a long list of reasons why it will be a difficult thing to accomplish: What Will It Take to Run A 2-Hour Marathon
Perhaps the two hour marathon will be like the four minute mile: once insurmountable, then broken, then broken often. If and when that happens, I think it will not be a near term event.
In the meantime, read the articles, especially the one from Runner’s World: it’s a fascinating study into biomechanics and running, as well as some fine infographics.