Anonymint, I don't know how you can fall into the beginner trap of saying the halving is "priced in".  For something to be priced in, it would imply there is some form of equilibrium at hand, meaning the price goes up, minining power doesn't increase with it, halving occurs, then mining power stays the same.  That isn't what happened at all though.  The price went up and more mining power joined the network, raising the price floor months ago and it has been shown to be pretty stable at the higher price.  Now when the halving occurs, the price is either required to increase a lot, or lots of miners will have to drop out.  There is no form of equilibrium at hand.  Tidal waves of cause and effect have to occur.

We also know that ASICs require lots of R&D investment and capital.  Since people have already invested millions of dollars in mining farms, there is no way in hell they are going to turn off their 16nm state of the art miners.  Current process node miners simply do not turn them off ever.  They always mine at a loss or buy coins off the wall to dollar cost average before doing that.  Even if you did think the Bitcoin price was unsustainable (it's not, market cap is still small), it's inevitable the price would spike higher before any unsustainable reality could set in.

The act of mining is also a decentralized exchange while Coinbase is a centralized exchange.  Supply is being cut in half on the DEX while demand remains the same because miners are simply not going to be turned off.  Centralized exchanges are forced to follow the price action.