Yes, I've asked the question before. And I'll say it again, at 50 my eyesight isn't as great as it used to be. I can watch TV fine, but trying to see the guide on a 55" TV at twenty feet (we have a long master bedroom) makes reading the guide a challenge.
Having the ability to adjust the size of the guide (4 rows instead of 7 I believe) would be of immense value to me and my wife.
I realize there's lot's of demands for enhancements (PIP or 4 screen stacking for football Saturdays on Android) would be awesome, and I'd gladly wait for the guide size if I could get the 4 screen stacking, but since I pay for the privilidge of this wonderful solution (truly the best thing since WMC and surpasses in many ways), I'll keep voice my wish wish list periodically. 
Thanks,
Jay