User blog comment:Hyperion602/DotA 2 Style Lane Setups/@comment-4846081-20131213233809/@comment-1330314-20131214070933

The new gold flow to supports means it's possible to assist a lane without suffering too hard personally or being forced to steal anything from the main laner, therefore the issue with a trilane bot wouldn't be supports stealing xp.

That said, apparently there's the rise of 2/1/2 setups, where a tank and an assassin/melee carry duo the top lane using the new support items. Their trinkets allow them to ward contantly, and the support items mean they can both get a lot of gold with relative safety. It makes the other two lanes a bit riskier, but junglers are a lot easier to anticipate now, so the risk is mitigated.