to 4.) krebs filled that role adequately. if casters REALLY wanted to appeal to a wider audience, they probably would include 3v3s and 4v4s. problem with those kind of games are: a) these game types are usually not very well balanced b) they are usually populated by lesser skilled players c) they usually end up being ridiculous spam fests. all these factors contribute to the replays/casts not really being educational, but "entertaining" at the most. what viewers perceive as being "entertaining" is largely based on their taste. i for one do not enjoy watching "entertaining" casts, but i really like watching educational ones, where good strats/good mechanics/micro etc. are highlighted and explained. krebs being antagonzied does have to do with his attitude towards other streamers afaik, i for one never hated on krebs (though i did not like his casts, but that, again, is up to taste).
This is a super good idea and one I've toyed with myself. I've just started casting, and my first replay was one showing how a noob managed to turn the table on a pro by hanging in there and coming up with the right counter to his strat. He'd have lost to normal play no doubt, but still, it's the kind of game that can encourage lower skill players.
I would love to try casting a 3v3 or 4v4. I am a fan of this game type, I think it is looked down on too much, they're just a lot of fun, and can be quite competitive. I remember watching a 3v3 of good players on Hill 351 back in the day that totally, totally inspired me to improve my play. You'd definitely need dual casters just to keep an eye on stuff and point out important things, so I'd try it if I could find another caster willing to do it with me.
But right now, I won't, because 3v3 and 4v4 are just totally broken due to Opel/strafe. Even with the fixes I don't think it'll get better, because I find Soviets need 5x the team coordination and the maps don't play to the strengths of Soviets at all (flanking and outcapping) because of the lower number of resource points.
Maybe it would be worth it to do a 3v3 or 4v4 cast just to get Relic's ass in gear on the most pressing issues, but it probably wouldn't be much fun to cast. If someone can find a 3v3/4v4 where Soviets win vs. a similarly skilled German team, let me know...Unfortunately in these game types its hard to even assess skill, but then again, no one has ever really tried.