Could Bard bring back "roaming"?
He seems to have a kit really suited for constant movement around the map. I'm imagining him moving around, taking cs/xp occasionally from lanes, but leaving the jungle in-tact for the laners to take whenever they can. He can also leave health pots under the towers of all the lanes, making the other 4 players feel more secure and mitigating the disadvantage from a lost trade in-lane. He can also surprise enemies with his portal, or if hes in the neighborhood drop a zhonya's to prevent a teammate from getting bursted.
His key mechanic is picking up charms that increase movespeed, give him mana, and give him experience, as well as other effects, so using this I think it would be better if he were constantly on the move.
I like to think of him as a wandering bard, keeping the morale of the whole team high and helping out wherever he is.
Just a thought.