Of course price action is confidence! But if it was really feasible, monero would worth like 1€ or 2€ each coin, at this time. The only this this attack showed is that Monero is anti-fragile and is ready to survive to this kind of attacks, even if playing dirt is needed, like DDOS the attacker to downgrade his hashrate. DarkFI will merge mine with monero with the same ethos, so as time pass the chance of a sucessfull attack is going down.