The real question is: How do you counter the new "meta" heroes? I'm guessing Night Stalker, Lich, Broodmother, Riki, Axe, and Slark are going to get massive boosts in popularity. How do you counter these heroes?
I'd say it's pretty obvious for Riki: Sentry Wards. It used to be the same for Broodmother but now she can just fuck off and walk over a hill/trees when she gets attacked, so now it'll be way tougher.
Night Stalker: Place observer wards a bit closer to his ganking routes, so that his ult has a harder time blanking wards on outside paths
Lich: Spammable or high-damage nukes, he doesn't have a great deal of health. Silences in teamfights to delay his input.
Axe: High impact slows to make it a huge pain in the ass to get into position to lock people down and proc swings
Riki: Easier to counter now that sentry wards are earned faster with even just residual gold
Slark: AoE stuns of any variety, even 1 second stuns waste a quarter of his ultimate. Heroes like Earthshaker, Nyx, Sand King and Dark Seer are already popular.
Broodmother: Heroes that can cut a great number of trees quickly, such as Timbersaw and Beastmaster, and global tracking heroes can be of use too.