This is a good show but it's time to develop these two characters. All the others have grown, even secondary ones like Amy, while Penny and Leonard just keep stuck at the same point.
So please Chuck Lorre, don't let these two only get together on the last episode, like Friends' Rachel and Ross, which was made with such a terrible excuse it was better to kill one of them. (No, I don't think that really, I'm just making a point here)
