It took approximately 6 hours for people playing WC3 DotA to calculate that the Lycan nerf delayed his Vlads by 2-3 minutes. So yeah. They'll adapt
Except it's much easier to counter him now. Warding easy or harassing his jungle will exponentially increase that 2-3 minutes -_-.
edit: Early morning mistype, "warding" easy, not nerfing rofl. Where as before he was insanely difficult to stop/counter, now he's on the complete other end of the spectrum. Catch him before 6 or yeah, ward his easy camp and he is pretty much done. Doom is a better jungler now xD.