Originally Posted by rocketdrive
I very good observation, but one that I believe is more blanaced than forcing a jungler. By allowing the duo lane to dominate without it being garunteed they would be ganked allows the duo top to have a competent chance alongside teams with junglers. This in itself is a risk, because this means no one will reliably take the buffs unless your team is that coordinated, allowing your team to potentialy have double red and double blue. Quite a sacrafice to keep top lane. However, not only are they potentaily sacraficing thier own blue and red, they are also at the 2v1 farming disadvantage. While the single top lane gets full EXP from no last hits, the duo toplane becomes starved for cash and or exp. The exeption here is if you solotop with a non-sustain champion, I.E. not garren or nasus or someone with some sort of built in sustain. While this will kill the fun you'll have early game, should you at any point get more kills than both of the duo top laners, you will find yourself slowly pulling farther and farther ahead, allowing you to bully 2v1.
You make good points, but a good dual top team will ward their own jungle. The jungler won't be able to get in, take a buff, and get out without being intercepted by mid. Also, with the stronger jungle, you're plenty busy with your own jungle until you reach higher levels.
Its also true that the dual top will get starved and that this may hurt them in the long run, but as you said, their success in offsetting this disadvantage will be highly match-up intensive, and you won't know until the game starts if they have a jungler. If dual topping becomes more common, I suspect only a few tops (ones with really good sustain) will be safe picks. I don't want that to happen.