At the highest level of play their doing something similar, to speed up the jungler and to keep him healthy for early ganks, top laners are following them around, often taking the small monsters and leaving the big ones for the junglers, that way the top laner either gets to go into a duo lane later (because of lane rotations) or he goes into his lane with more gold and exp against his laner (because he will have more minions to clear than his opponent.) This of course is opposed to the top lane taking a camp, both work fine but in the first scenario the jungler can pull off a really solid level 3 gank.
As for your idea, there is a reason that the meta is support and adc at the bottom of the map, the support is SUPPOSED to be building items that are cost effective and that support his team (glaring at you leona with a sunfire cape or morgana that built straight AP and no sightstone,) it is also the supports job to carry the adc in the early game, by cc, peeling and assisting with kills. The adc of course is for objectives and that sweet late game damage, if you take the support away from them, sure it adds more to different styles of game play and different team comps, but do you really wanna leave the guy that is in charge of ripping down objectives that vulnerable?