I think having both TB & TBN servers still running would be awesome. Also, continuing to have in game/in app purchases will make it easier to allow the game to be F2P. Now if there was a way to put TB on mobile systems (iOS/Google Play) you'd make a killing with in app purchases dude. Although far fetch, possibilities are endless...

edit: Also, in terms for in game currency. It'll be smart to hop on the DGB wave. If you know wassup, then you know