Honestly, ZP is like this site's jugular - cut it and it'll die a slow death, as fresh traffic dwindles and the users start tailing off one by one. Unless the site found another big hit, they'd lose a ton of revenue, which would seriously harm the site.
Everything else would be a blow to lose, but if its just one at a time? Merely a flesh wound.
(that's not saying everything else is bad. I especially love the Top 5's, Unskippable and Critical Miss, but they hardly generate ZP level traffic)