That's an interesting question. I'd think that if this was a real danger on Steem, then there would already be some movement in that direction. However, people will always be motivated by economic interest. And as long as there is volatility in the crypto markets, I'm afraid short-term interests will win out over long-term interests most of the time. So, yes, I'd argue there is a danger of this happening with any blockchain based on DPOS. But it's not guaranteed to happen. EOS may have been a special situation where controls weren't set up early enough to protect the entire chain from this type of corruption.