I'm sure that the mid-range larger harp space Bernina will come. I may think a little with a commercial hat on here, but once the sales of the 820/830 start dipping, we'll get that machine. Everybody has to decide themselves if they want to wait that long.
About harp space in gerneral, and specifically my little Bernina Activa 220: I have to keep reminding myself that it has this lovely function of sewing in a straight line, but in the opposite direction, at the press of a buttom. It takes a little getting used to, but it means that I can have the bulk of a piece always on the side where there is lots of space.