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For what it's worth, this was the first question on the State of Security panel at the Devcon4 this year, and you can hear my answer that is longer than one tweet here:https://www.youtube.com/watch?v=CjQZFeqOgro …
Here's my prediction for the big Ethereum problem we discover in 2019: Many contract upgrade mechanisms are broken or unusable as deployed. A major project will attempt an upgrade that locks its contract in a broken state, necessitating a migration.https://blog.trailofbits.com/2018/09/05/contract-upgrade-anti-patterns/ …
Wanna set up a yes/no market on Augur?
I wouldn't bet against that prediction actually... I'd only bet on "no large-scale re-entrancy exploit in 2019" 
I agree that we will likely see instances of the issue you described, but I propose a potentially more damaging candidate -that 2019 sees large changes to base layer/existing standards and a majority of existing contracts aren't flexible enough to adapt, necessitating a migration
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