I'm planning on continuing to enjoy my very slightly deformed 6+ until 60 days +/- prior to the next new iPhone. After inspecting mine, the genius said they'd replace it any time I want.
If I could count on getting a stronger, less fragile replacement I'd exchange mine now.
But the production line is insanely busy and they probably haven't changed anything, so the risk remains as great as ever. I'll wait and have it replaced in six more months then sell it. That'll net maximum Market value.
The good news is it's highly likely that Apple will carefully and silently fix the problem in the 2015 model, that's what they did when AntennaGate was a problem.
Apples second attempt at designing a durable phone is sure to be successful. After all each and every S model I had was better than the original.
Experience tells me the 2015 iPhone will be the best of them all and the one I'll buy upon release.