As far as I understand, this measure in all the states it's used in has no penalty or flag with it. So it wouldn't impact them negatively in the future at all. It's also 100% personal choice so it cannot be forced on someone, merely suggested.

There are many gun ranges that will rent low cost long term storage. I've known many people who have done so when they have someone in the home who can't be around guns.

In many cases, suicide is a snap decision. Of all my attempts, the longest planning period was three days. Seven days is quite a while to seek help/back down. The article also discusses that they think it needs more work and want to expand upon it. But that it's a start for those who are worried about gun access.

Fourth paragraph or so of the article "If they change their mind, they have to wait seven days for the county to revoke it."

Yes, mentally ill people can actually have this foresight. If I still lived in Washington, I'd absolutely do this. I have short periods of mania and depression where I've been tempted to commit suicide. This extends that waiting period by a substantial amount for the person to change their mind and seek help.