I'd be more in favor of a 1-2 week power down time.

I would as well. My concern is that the distance between 13 weeks and 1-2 weeks is so much larger then with 4 weeks that people will generally be turned off by that idea due to the gravity of change.
4 weeks being already imbedded mostly in the mind of the community and a natural first step. Hopefully if a change is implemented it could be improved on by the devs with the ideas Theycallmedan and others have presented.

Security against hacks

I was never really convinced by this argument. If we deem the chain safe then the danger comes mostly from phishing attempts. If Hive, in comparison to other blockchains is deemed "safe" regardless of the powerdown time (and lets not forget our multiple passwords), why do we think reducing the powerdown time would adversely affect safety comparatively to other chains?
The only aspect in favor of the safety argument being the daily usage of your account. But that then as well falls on personal responsibility.

Convincing the community to vote for 4 instead of 1 week seems much easier at this time. Seeing how it goes, with the 4 week reduction being a reality, going further down would be a much realistic discussion.