Why is it that some people think Blockland should get a new engine? In my opinion, anyway, Torque is fine for Blockland. I don't think Blockland could be quite as good as it is now on any other engine.
The only motivation I can see for Blockland changing engines would be better vehicle physics and buildable vehicles.
The current vehicle physics aren't that great (you can drive through bricks) and buidable vehicles would be really cool but I don't think that's worth porting the entire game to a new engine.