The App Store is huge. There more apps than an average person can possibly browse. One of the problems I see regularly are abandoned apps — apps that receive no updates or support.
I would appreciate a purifying rain to cleanse the App Store of cruft. If Apple pressed a rest button and removed all apps that have not been updated in the past 12 months I would buy more. I would worry less about abandon-ware but it would also be easier to indentify the cream of the crop apps.