I have to agree. It wouldn't even be "7.1 sort of", but more "5.1 with two extra speakers miming the two sides." You wouldn't get any imaging advantages of 7.1, the sound quality won't be any better, and I wonder if you'd hear any difference at all over a standard 5.1 setup.
I'd just go 5.1, use the wireless system if you need to do so to eliminate wires, and call it a day. It'll be more cost effective (two less speakers, one less wireless unit to buy), and you'll get the same benefit.
If it were me, I'd use the money saved to get a 7.1 receiver and take advantage of some better features. Most 5.1 receivers are fairly low end (from the typical brands, anyway.) You can always turn off the surround rears in a 7.1 receiver and it will work as a 5.1. Then if you're in a place that allows true 7.1 (and the wife comes around or you find a way to fish the wires through the walls), then you already have the receiver for it.
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