No way it'll ever work unless an ARM/Linux version of Blockland is made. The ARM version of Wine is just for running ARM/win32 applications. Emulation will be far too slow and honestly it'd probably still be too slow even if there was a native version. I'm sure we remember the horrible lag from people running servers on like pentium 3 computers and the raspberry pi barely compares to that.
There are other small, low power computers out there you can look at. NUC, Liva, BRIX, etc. All kinds of little, low power consoley computer things that'll run proper desktop windows/linux and also don't disappoint with respect to capability. Just nothing as cheap as the pi. Technology isn't at the point yet where you can get something for $35 brand new that can do much beyond very simple web surfing and simple games.
