This would be the worst case scenario on how to deal with Islam.
I would agree with this law if all peaceful ways of dealing with them fails. Which unfortunately means some nukes will have to be set off before that day comes.
At that point we could take over mecca and not allow any Muslims in Mecca. Officially by their own laws would make all Muslims Kafirs in a few generations. Which they can't change that law.
The peaceful way to deal with them would be to set new trade deals with Oil based countries to allow apostates to lave Islam. It would be a long term solution that would take many generations but it would work. As that trade deal is set up in Indonesia (in the late 60's) and 2 million Muslims are leaving per year.
Why would I want to see a peaceful eradication of Islam? They are criminals, plain and simple.