Al....here's a perspective from someone that's actually been killing animals with 4 blades for two and a half decades....and hope to be doing so 2 more decades from now.
I think a 4 blade STOS would be a great head...add another blade to a head that is already very well made and stout as an ox with a great angle of attack, and I think it would make a great hog head for sure....and would be good for other big game as well.
There's also a few new 3 blades on the market, and another one coming I hear, soooo....it aint all 2 blades that are coming out.....and, just because a new head does come out, doesn't mean the head of yesterday all of the sudden don't work. If that was the case the head of choice for me would have been out of production 30 years ago, but I keep dropping animals with them....yeah, a 4 blade.
So, Al,...yes, I think a 4 blade STOS would be a dandy head, and I would have no reservations using them on big game at all. If you've got any pull...get it done and I'll be 1st in line to buy a couple dozen.