There are massive, momentous opportunities to create billions of dollars of value in tech in the next decades and beyond. Just imagine every thing you could conceive of that should be physically possible, but no one does currently. The space is almost unbelievably big.

Granted, most of the things you would come up with are currently infeasible due to technological or scientific prerequisites not being available yet, but many of them are also in the realm of "possible, but no one has figured it out yet".