We had a problem in the ALAC last year with people ceasing their participation without withdrawing. They counted toward quorum requirements but didn't vote, which meant that the ALAC couldn't approve or disapprove any applications. So in addition to the language below, perhaps continued non-participation, however we define it, could lead to automatic removal, without any votes. What could happen is that more than 30% of the ALSs stop participating and then we can't vote them out because their non-participation has effectively prevented us from obtaining a 70% vote. This is probably a realistic concern when we have only 11 AlSs. It wouldn't take much to tie us up.
I've updated parag. 16 of our OP to:
16. When an ALS does not vote in 3 consecutive NARALO elections, or does not contribute a comment on ICANN policy (either directly to ICANN or through collaboration towards a common NARALO comment) in 12 consecutive months, a vote of not less than 70% of the North American At-Large Structures then accredited will rescind its member status within the NARALO. The Chair will then submit to ALAC a request for de-certification of that ALS.