Does anyone see a problem with deflation and massive hoarding after all of them have been printed out?
Yes, you are right. Why would I sell my bitcoins, knowing the price will always go up. A market can only exist with a bid-ask side.
Eventually, you have to spend money to survive. You have to buy food, shelter, water. You'll choose to pay for entertainment and the things you desire.
I know that a cheaper computer will come out in 5 years that will do far more than the computers available today, but I still but a computer today if I have a need for a computer.
The same will be true of anything else deflationary. Sure, there will be an incentive to encourage individual saving, but that isn't necessarily a bad thing. Meanwhile people will still spend on the things they need and want.