Let me sum all of this up, 2x1's are hard enough as is, we don't really need a harder jump, secondly, for a brief amount of time we tested with 3 block jumps and it didn't go well, so the likely-hood that they will be brought back is very low, and personally I don't want to see them back, newer players already have a hard enough time with 2x1's (Heck, I even struggle with them when I play) and we don't need to make it harder on them, trying to get experienced players is also hard enough, and jump courses are cheap enough as is.
I don't want to see 3 block jumps back.