[saiya-jin]

Wolves wouldn't attack you, I guess you read one too many children's stories. The only possibility would be desperate, starving big pack of wolves and a lone traveler in the middle of nowhere. I've experienced it a bit, alone in winter mountains ski touring and camping, but even then they just carefully observe from distance and then move on.

As for bears, we have them back home in eastern europe, in fact vastly overpopulated given the area available and their territoriality. Practically no attacks on cyclists, hikers etc (yes like 1 every year or two something minor, more people die from ticks and tripping over stones and roots). If you make any noise while in the forest, they will notice you from far and avoid you.

That said, we don't have grizzly or polar bears, those are a bit different and majestic beasts.

As for general discussion, your point doesn't make much sense. We could wipe out just types of mosquitoes responsible for super-deadly diseases like malaria and dengue (and few others) and keep the annoying but otherwise harmless suckers still around. In my subjective opinion we wouldn't even notice the transition (at least not in the bad sense).