> Anyone with enough capacity can basically seize control of the currency, so it's anything but stable. The amount of resources required to execute this attack

> Anyone with enough capacity can basically seize control of the currency, so it's anything but stable. The amount of resources required to execute this attack is moving higher at a rapid pace. Also, a 51% attack can gum up new transactions and potentially double spend, at least until people realize the attack is happening and stop signing new transactions. It can't rewrite blocks from the distant past to send everyone's coins to the attacker's address.