I honestly don't think they expected this level of success.
Now the trick is going to be sustaining a good, active user base. Pushing updates that help with performance + adding new content relatively quickly is key. Maybe adding things like 'swarms' of Pokemon, etc.. Of course, adding trades is great also. Plus daily login freebies would probably be good.
Heh, how long til they update it with Shiny Pokemon, or Gen 2+.
I agree, I hope Niantis will take care well of this game otherwise I wish Nintendo will step up and do it themself. So much potential here.