we're all kind of speculating until we see this actually roll out. I'm betting however that most people won't pay, and they could end up shooting themselves in the foot.
Anybody remember Photobucket.com? Photobucket was a free third party photo hosting site. At one point most of the photos on this site were hosted by Photobucket. They then imposed some really high fees, and everyone on here quit using them, and found other free or cheaper ways to manage digital images. Photobucket isn't publicly traded so its hard to see how they've fared financially, but it appears that they are a much smaller company as a result of changing to a subscription model.
To a lesser degree, I think Strava runs a similar risk.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.