There will be no "confirmation" for an ending bearmarket for a long time. Instead the sword of Damocles will be omnipresent. At these market stages (no mass-adoption) pseudo-"stability" can be wittnessed.
bear market will always exist. even when the price is $2000. you will see bears yelling.'bitcoin soon $1000, sell while you still can' this will never change.
Well, yeah... There will be people screaming those things, sure. But the general sentiment will have changed and the influence of the bears will be significantly smaller! Of course then we'll have to deal with completely out-of-control bulls that scream "new paradigm!" and won't see the crest of the wave when it's there.
The nice thing about out-of-control bulls is they are here for a few months, and then hibernate. The bears have been out for a while now.
The bad thing about out-of-control bulls is, though: They spend all their FIAT to buy BTC (preferrably on leverage) and never close their longs. At some point there's no money entering the market again and the bears get a pretty green light.