I watched that awhile back, and actually was good info, especially since I live in GA, and tow in the same areas he does, and currently with a similar size camper.
I'm probably buying, or atleast ordering a 7.3 in the spring. Before the 7.3, once you hit 10-12k lbs, you were really in diesel territory to have a decent tow experience. Now, I think you can tow with a gasser up to the 14-15k range. It isn't gonna compare with a diesel's torque, but for a midsize 5th wheel for the weekend warrior, it fits that need well.
The payload different between the 7.3 and 6.7 seems to be 800-900lbs from the sticker I've seen. While the engine weights are not that big, I think the DEF, and other **** they have to put on the 6.7 adds a couple of hundred pounds.
I like the fact you can see things under the hood. I still do lots of my own repairs/maintenance, and with the 7.3, I should be able to easily do alternators, water pumps etc. The 6.7, I'm always hearing about having to take the cab off to replace parts, I've never worked on one, so I may be wrong.
I don't think the 7.3 is a replacement for the 6.7 in all cases, but for someone with a 12-14k lb camper that dailys it, and tows 10-15 trips a year, it really is a great fit. I think with it being a simple pushrod engine, that it hopefully will be a 300k engine, I think that is the duty cycle Ford is expecting from it.