Which would be exactly what I don't want. I want combat over with ASAP. My group has been experimenting lately with an idea from Core Elements: simple opposed rolls to decide a winner & loser in any given combat. The amount of damage being dealt (to both sides) is really the only sticking point we run into.
If making combat last longer is a goal for 4e, that would be yet another reason for me not to go that route.
With regard to kruthiks and such being in the MM, if I were to go with 4e, I'd likely do the same thing I did with the 3e/3.5e MM...excise 90% of the critters completely.
Regards,
Darrell