They may just leave altis all together if this new Tanoa map is much superior, however I doubt that, just imagine all the new objects and structures that will be added in the eden editor
The problem with the Tanoa map is that it is very lush and full of jungles and not many citys or towns, therefore making it a little difficult and possibly a bit dull aswell as people will mostly be out on the roads. So only 1 server will probably be used, who knows might even be server 1 Atlis, Server 2 Tanoa and server 3... well
Now don't get me wrong I would absolutely love to play TanoaLife, just imaging opening up 300kmph with a sporty on the main road around the map in circles, Hawaii 5 0 Style and then responding to possible situations. And also getting into helicopters on night ops in the jungle!