Possibly. It also depends on the mapview that you display. if the user is zoomed out all the way the UI becomes useless.
I just checked my own code and I'm not even using ItemizedOverlays. I use individual views for the annotations, and I assigned a TTL to each of the views. If they haven't been shown for a while (2 minutes) they get axed from the MapView. Every now and then (when the map is moved/zoomed substantially I load the closest x annotation views (25 in my case) onto the mapview. Again - the real reason for that was not the concern that the system could not handle the number of items, but rather that the user wouldn't benefit from 1000+ icons on the screen.
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