It is far too early to talk of the campaign bogging down or even faltering. Doom-mongers should remember that the allied attack started only four days ago. They have been spoilt by memories of the briefness of the Gulf war of 1991 and the rapidity of the recent Northern Alliance victory in Afghanistan.
Also - the ground war in 1991 lasted 100 hours -- That is 4 days -- And our troops were barely on the Highway to Baghdad.
Here we are after 100 hours and we are within 50 miles of Baghdad --and have had to fight for every mile. Our ground forces are actually making better time and doing more fighting than in 1991!