There are also other approaches to reducing hacks such as building in 2FA with a mobile app. Lock-up is not the way to do this.

How exactly will this prevent any hacking from the blockchain level?

If people want a longer lock-up for security purposes then perhaps the savings account feature which has never been used much can be repurposed to a voluntary longer safety-focused lock up.

The savings feature works only for STEEM, not STEEMPOWER. Which means, in order to be "save", someone had to forfeit any rewards earned through vesting inflation or possible voting-rewards.

I get the point of the lockup currently being a somewhat dis-incentive. But we're not fixing the system, by turning a screw without asking whether or not the screw is at the right place or if the screw breaks if we turn it more.