What we know for a fact is that they can reach consensus and run new code in an extreme situation, one can see it as a pro or a con, but we all know it is possible. Also a few whales can move the witnesses around at will to ensure those who agree are in top positions.
What you have listed is some very good reasons they will not, and why they don't. I think our witness group has a lot of integrity and financial motivation to NOT do anything to still funds or print them, but it doesn't do anyone any good to pretend that the DPOS can not be compromised.
I think it is fair to say it is secure enough.
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POW can be compromised as well, but people think the difference between POW and DPOS is vast.
I do not think so.
That's fair and I agree.