Only one of those 5 cameras is broadcasting any FPV video. The others do nothing to improve it. They only keep the main camera from running into things, and help stabilize it when within 33 feet of the ground, which is good for long exposure shots.
The primary purpose of the Phantom line today is as an aerial tripod for photography and videography. As such, it is a tool, and not an end in itself. If you are already getting the results you need and want, no need for a different tool. It's the output that matters. If there are any video or photographic opportunities that you will miss out on because of the lack of a P4 which can deliver them today, the few dollars you save may not be worth the wait. In the past, a decent DSLR with a quality lens would set you back $2,000. Then you needed to rent a helicopter for $500+/hr to shoot from, to get aerial and video shots with that camera. When you can get unlimited aerial video and stills for a fixed price of $1400 today for a full year until the P5 comes out, it's already a steal!
