The chance of getting them to open more servers for BnS is very slim now. When BnS first released there used to be 8 servers for NA and 8 servers for EU if I recall correctly. Now there is only two servers for good reasons. There is just not enough player base to justify keeping more servers then what is needed.
My gut tells me they will keep the bare minimum amount of servers. Then keep on dishing out new game content/updates once in a while just to milk as much real money as they can. Then once the profit is not to their liking they will pull the plug.