https://steempeak.com/steemtron/@edicted/biggest-threats-to-steem

As far as voting in new witnesses to bring it down... seems impossible to me considering the actions we can take against that and how bad it would look for Justin Sun.

I've also talked about how Steem can easily survive with zero core development for years. The real money should be coming from forward-facing dapps, not internal development. What we have now is already pretty good and we could coast on that for quite some time. Ideally, the big money maker dapps would decide they need certain features and eventually program those features themselves and get them approved by the witnesses. Not to mention we already have the SPS funding development separately.