That was an scary scenario, if people are worried so much about the reward pool then that means less people in the platform means bigger reward pool to be split between them.

But check this post by @dragosroua 10 months ago explaining why there is no such thing as draining the reward pool. https://steemit.com/steemit/@dragosroua/why-there-is-no-such-thing-as-draining-the-reward-pool