20-Year Prospect
As long as people are having babies, there will be a need for daycare workers. And since people seem to like having babies, this job is pretty safe.
It's likely, though, that the requirements for working as a daycare teacher will change. As society pushes for increasing standards of education and children have more access to technology, the pre-K curriculum is likely to become more standardized like the K-12 curriculum is now. This might mean that would-be daycare teachers will have to pass more rigorous certification tests, depending on where they live and whether or not the standardization happens on a state or national level.
As standards rise, it's a pretty safe bet that full-time daycare teachers will need an associate's degree to qualify for the job. No worries, though—that Napping 101 class is a breeze.
A rise in your paycheck, though? That's not so likely to happen. Unless the USA goes full-on Finland and decides to hold its educators in the same high esteem as it does doctors (source), your paycheck—like the paycheck of all your education peers—will remain low compared to the amount of effort you put in.
At least that guarantees that you'll do this job because you love it. Right?