If we rely on their cloud services for activity tracking and app downloads then it will be useless if FitBit doesn't maintain the platform.
I have to say I'm really disappointed and this is a huge blow to people that invest in startups offering hardware. If the company fails forget about the smart stuff you bought, it just won't work anymore.
We should look for ways to minimize the impact on backers. Sadly we'll see more of this in a future in which the products depend a lot on the company cloud services to operate.