That is true about the bridges, but wouldn't a light tank have just as much trouble as the Bradley and Stryker?
As for the explosive reactive armor or the active defense system, the Isreali invasion of Lebannon showed how both those systems could protect and fail if the enemy made use of their AT-Weaponry the right way. The Isreali's lost a decent amount of tanks in the fighting.
The Stryker was supposed to fill the shoes until they came up with something better, but so far, I haven't really heard anything from that department in moving towards creating a light tank. If we did, I could see it more designed towards urban warfare than what we are encountering in Afghanistan.
I haven't been to afghanistan myself either, but from following the war there, I'd say that they North and North-Eastern areas of the country seem more suited to Bradley and Humvee type vehicles, while the south is more akin to the use of tank, IFV's, Light tanks, and humvee type vehicles. But that's just speculation like you said...
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