Length becomes a potential issue in terms of parking it somewhere, but maybe not. Like a big 5th-wheel travel trailer, in terms of size.
But as far as what you've mentioned for needs/wants, I thought it was a start. Some features being replaced with others, but covers up to the top end of attendance, while making it a tad easier for half that (only firing off one pit, needing 1 fridge/warmer, etc) when the times call for it. However, it's your setup, and the same each time.
Again, may be a bit much, but can't say it wouldn't fit the bill. The biggest/smartest feature of that setup (to me) is the fire suppression system. If something were to ever get out of hand, it would be worth its weight in gold, let alone brisket.
Or maybe the "concession" area would be a perk, depending on setting I guess. Not like you couldn't fire it up for a big end of season Burnt Ends cookout on someone's ranch, things like that.
I don't think it would be as bad as you think. It's still going to be hot, but if you look close, that part of the trailer is screened in, so there's a lot of airflow.