If you don't see the loss of resolution at 720p, then there would be no reason to go back to 1080p. If you're sitting far enough away from your tv, the difference might not be noticeable. I'm 8 feet from my 46" set and I can readily see the difference between 720 and 1080 on 1080 material.
AT&T U-Verse Northeast Ohio
Denon x4000, Carver m1.0t, Samsung LED TV, B&W 704 mains, two M&K subwoofers, Oppo 103, Roku 2, etc.
Headphone system: Sennheiser HD600, AKG K702, Hifiman HE-400i, Marantz HD-DAC1 (also used for music playback in the main system, Marantz CD5004, Denon DVD-3910