There was a sort of thought that the real-deal folks were 100% film but I think that faded away even before 220 was kaput. The fact is that reception photos don't need to be shot on film. Personally I endorse a hybrid shooting system but differently than the way most people practice it. (wedding shooters are kind of obsessed with having their digital photos match their film scans which means they're shooting one scene on both, which I think is a mistake). Anyway I know of one or two all-film shooters but I know of a lot more who shoot mostly film and integrate some digital. Some of my favorites are running a Rolleiflex for film and Leica digital cameras such as the M10 or SL system. But really the home run has been the GFX system...
On the film side though I have a few clients who are mostly 35mm at weddings and I think their work is fantastic. 35mm offers a lot IMHO and unless you're doing a group of lots of people, the quality is there. I find that the grain is a problem when you have a big group...it just doesn't work as well, you want that smoothness that you get from 645. I left the weddings game this year but if I was doing all film I'd be shooting 80% F6, 15% Rolleiflex, and 5% Pentax 67. I'd definitely have a loader with me. Group shots on 6x7 are really something...and catching moments with a Rollei is just magic.
On the last point, you are problem correct that paying someone even $200 is probably cheaper than buying all 220. Doesn't mean I wouldn't like to see it on the market...family sessions, engagement sessions, they still would benefit. Hell even having a 12/24 Rolleiflex in any situation would be nice. My wife is very patient during my 220 reloads.