Good idea but your trusses shouldn't be falling down even with no plywood. Common sense goes a long way when you're bracing trusses. Do some planning, make sure you have enough material and all your guys know how you want it braced off. The times I've seen trusses fall is due to guys either being lazy or inexperienced. I saw a crew get tired of nailing uprights to the building at the gable ends for support, so they just left them off. It worked for a while but eventually they had one slip off the end of the building. I've seen trusses simply slide off the top of the wall while they're moving them around and hit somebody. That's mainly due to inexperience, make sure you have an experienced crew for your roof. Put the beginners on walls, floors, or pick-up.Best solution so far that I know is setting plywood as soon is possible at part of roof that is framed. Any other idea? Maybe set 10 X more roof braces?
Just saw the video, looks like the wall came down while the trusses were on it. I don't know what they did, but my guess is someone took the wall braces off before they even had sheeting on the roof. And they might not have had the new wall nailed to the old existing wall. So the wall was sitting there loose, no braces and not attached to anything. Those are small trusses so they might have gotten lazy and left off the 2x4 brace running along the top of the trusses as they were rolling them. So it could have been a combination of things. But like I said, if you're going to roll trusses then you need some experience, don't learn it over the internet.