That Guardian article is out of touch with what has been going on lately. The rebels have, by force, taken towns that has been defended by loyalist troops - no stalemate on the eastern front just yet, that is certain. Also, if the rebels manage to take Cirte, then the road is almost "open" to Tripoli.
Much closer to Tripoli than Benghazi - in fact, just outside Tripoli - lies the the rebel held city of Misurata. Misurata is about the same size as Benghazi (and the third biggest city in the country it seems), and is the next major city on the road from Cirte. That rebels in Benghazi will not march on Tripoli may well be so, but there are rebels much closer that can do just that instead.
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