Well, a major part of the joy of the X10/X20/X30 series is that wonderful manual zoom, f/2-2.8 lens. I know that in terms of narrowness of field etc that translates into much smaller equivalent apertures, but for light gathering it's still pretty much unbeatable across the X range, AFAICS. So from my point of view, no, it's not a X30 replacement!
I still think the X70 was a missed opportunity. If they'd made that a 1" sensor fixed zoom (even with a shorter range, as Sony did with their RX100 2/3/4/5), it could have been a great camera.