That problem is partly solved with marksmanship and partly with knock down power. 1911 helps with the latter. I understand the need for more rounds, but it really is a need for more effective rounds. But like what another poster said earlier, you take an M4 when you go one the other side of the wire. Actually, you should take an AK or M10, but that's a different discussion.
The thing about pistols is that some people try to make them primary combat weapons. The MP5 was designed to be a pistol round with high capacity. Now we want the same thing out of regular pistols.