Yes people will be able to earn crypto's to view ads and buy stuff from those ads on FB.
Zuckerberg intends to peg his currency to the US, Euro and Japanese Yen and pay the consumers of Facebook fractions >of cypto's to view ads and interacting with online shopping.
FB isn't going to fail unless they regulate it out of existence, you are under the assumption that everybody cares about the politics when in fact the majority of people simply do not care to engage on a daily basis with what's happening outside the realm of their little world. I find this quite often when something major happens as I am very politically minded and when something major happens is about the only time people actually want to hear what I have to say politically. Steem outside those who seek intellectual stimulation will not benefit much from a FB failure if one did occur, there are way more sites out there now in the crypto world that is much easier to engage on as the rules are not so stringent. I can just see it now people being flagged for making a fraction of a penny off posting their grandson's birth announcement. Get real. Over time things do get old, a new generation brings forth something more creative, exciting to engage with, in that sense one day FB may fail but I highly doubt it will be a huge advantage to Steemit as Steemit doesn't seek to draw out the average joe in participation.
RE: Comparing Steem To Facebook’s Blockchain Libra With Andrarchy