So even Rocket Artillery will fail to wipe out blobs?
If you don't want to get obliterated by the firepower of 4 players, don't play 4vs4, it's what is going to happen there more often than not.
Yes, it would fail to whipe them completely, nevertheless blobbing would still be punished.
Actually I rarely play 4vs4 and 3vs3 these days, because all the indirect firepower is horrible in my opinion.