I'm still bummed about this.
I have both XIM4 and Apex, because I have a double setup (to play with GF and friends).
It's much easier to have XIM4 & Apex instead of double Apex, because it's easier to manage with 1 device.
IDEA: I'd pay for a XIM4 update (separate firmware, next gen only). Do preorders and if enough people are interested, you could have it funded.