This is a recent tweet from one of the core Ethereum team.
Vlad goes on to follow up the tweet with a blog post to further explain his tweet. Imo it was well received by the community, it showed a human side to the crypto-space with complete transparency from a person who is at the heart of the project.
Some key takeaways from the post:
Is Ethereum safe?
I don’t think so. I absolutely cannot guarantee that the network won’t
be 51% attacked (though I would like to believe that a hard fork would
minimize damage from such an attack). I cannot usually guarantee that
a smart contract will behave as expected (I don’t need to mention that
I sometimes like hard forks here, too, do I?). But lots of really
smart people in the community are working hard towards making Ethereum
safe, with smart contract formal verification efforts and with
proof-of-stake consensus protocol research. I think that we will
continue to make steady and impressive progress on these safety
Is Ethereum scalable?
I don’t think so. While miners can increase the gaslimit without
changing the protocol, the blockchain is still single threaded. State
channels can potentially provide a large constant factor improvement
in the short term, but they have their own security problems (to use
Vitalik’s language, “channels turn a blockchain’s liveness failures
into safety failures"). Sharding promises to do much better, but is
likely still a ways off. Still, I think that we will continue to make
steady and impressive progress on the blockchain scaling.
Here's the blog post!