If you want to see the hockey stick growth in running, you need to look more broadly to middle distance races and you need to specifically look at the segmentation of masters age runners and women.
Your attempt to show that Crossfit is growing at a uniquely fast pace among fitness activites because its open went from 0 to 209,000 in a handful of years is sort of silly because the numbers are basically rounding errors. And crossfit growth is already plateauing -- I'll put money down that there wont be a open with half a million participants before 2020.
Female race finishers grew from 1,199,200 in 1990 to 10,844,200 in 2013. That's 18+% annualized growth on top of a respectable base. And while crossfit boxes push heavily to encourage their members to participate in the "games", growth in competitive running is largely driven by participant self-motivation and not contingent on membership in a related paid program or in response nationally coordinated marketing campaign.
http://www.runningusa.org/2014-state-of-the-sport-part-III-us-race-trends
The reality is that running dwarfs other fitness activities in size and is itself growing at a tremendous pace. As compared with other sporting activities, its also a relatively low-cost endeavor which means that there is a huge amount of room to capture additional revenue from lifestyle participants and that customers are less likely to be highly price sensitive. This is big business and the sad thing is that before being sold down a river by the likes of George Hirsch and Mary Wittenberg, NYRR was a great community based organization that facilitated runner access to city streets and parks. Now its a proxy for corporations who want to sell back to us what we used to own outright.