The price of Bitcoin has dropped today to almost 8.000 USD. Was this predicted? and if so why, will the price eventually bounce back up?

Some people predicted it, or at least recognized the possibility:
DrBitcoin: https://bitcointalk.org/index.php?topic=5181741.msg52358429#msg52358429
xxxx123abcxxxx: https://bitcointalk.org/index.php?topic=5128394.msg52495185#msg52495185
dmwardjr: https://bitcointalk.org/index.php?topic=5140701.msg52540049#msg52540049

As for the why.......typical price action, really. Honey badger being a honey badger.

The Bakkt launch worked amazingly as a "sell the news" event. At the end of the day, it's impossible to predict exactly the form corrections will take. It would have been perfectly reasonable for the market to stay sideways in the $10,000s too. You only ever know in hindsight.

I still believe the downtrend since late June is just a correction to the bull trend. I'd be surprised if we weren't back above $10K by October.