Oh, come on! :roll:
Option #1 : Buy a router for about 40$ (£25), use your laptop through that with a Wi-Fi TV, and free one HDMI inlet on the receiver. There, optical will be useful, allowing you to send the sound of your laptop back to the receiver from the TV. Or use Ethernet... Or something.
#2: Plug your camcorder only when you need it - and does it really have to be with HDMI? Does the sound really have to go to your receiver? Could you not send it to the TV directly, and use optical to get the sound out to the receiver?
#3: Plug your TV/Satellite with component and composite cables - many of them HD progr. out there are still using a 720P signal anyway. Or send it straight to the TV, and use optical once again.
#4: HDMI your PS3 instead of your XBOX. Use component and composite for the latter.
One of these options, or another, should be possible and easily arranged for you, without compromising anything you don't want to... Any decent 3D TV will offer Wi-Fi connectivity, many are Wi-Fi ready (just like the WHF acclaimed Panasonic Plasma GT's or ST's), some with separately sold accessory. In any way possible, just shift priorities, mate!
Would not be that bright to have an A/V receiver, a PS3, and not wire them together... It should not cost you more than £25, and could easily be free, whatever option you choose. Yes, a fully updated PS3 can do 3D, if you have the TV, googles and a good 1.4 HDMI cable.
I hope this was helpful for you!