Dollar is involved every where in the world, basically the closest thing we have in the world to a global currency yet if you look at the american stock markets it is still around the marketcap of bitcoin if it hits 100k, you think the american stock markets combined could be same marketcap as bitcoin?
That is very max the limit we can ever hope to achieve and definitely not the higher. Of course this doesn't take away from the fact that bitcoin definitely will go up when bakkt really gets up and going and starts doing what they have been trying to get approved of.
Bitcoin doesn't need to be as used as the dollar when it comes to transaction volume for it to reach $100k. And remember that holding bitcoin is using it even if you don't transact with it.
Price is a function of supply and demand, that's all. As long as there's demand for what bitcoin offers, the price will go up. Bakkt allows for a ton of pockets to get involved within the market. Bakkt needs to buy bitcoin to settle the contracts, so this is not phantom derivative bullshit like CBOE futures.
A nice pic for context: