If iZone shows no signs of progress in the near future I think we could consider it a failure. Its the same thing as iEra. There is nothing to attract players who are already established in iEra to play iZone.
Move all the iZone gmaps to the iEra server. Make all the iZone content available to iEra players. Merge the stats and purchases.
Without the burden of downloading a separate app, reuploading and paging for customs, losing all stats, iEra players might actually play the content on iZone.