Like my dad said...
Necessity is the mother of invention...
and laziness is it's father.
If you can come up with something lazy people need in order to be more lazy (and yes, we are ALL lazy at heart), and it doesn't require work to use it to be lazier than they already are (it would defeat the purpose if it required work), then it will be successful.
Or if the laziness payoff GREATLY exceeds the work it takes to use it or learn to use it.
laziness payoff - work = new technology's odds of success
And don't forget the cost factor...every $ represents work, too....you had to work to earn it.
Consider the automobile...much less work than walking and carrying your stuff from point A to point B...and much less work than caring for a horse. It was destined to become a success.
The only other way past the above rule would be to sell your idea to big business and convince them that they need it and that it will save or earn them money, and then rely upon them to force the rest of the world to learn it and use it.
Considering the cost of a computer and what it takes to become computer literate, do you think the majority of us would own one, or even know how to use one, had we not been forced to at some point either by our jobs or by schools? (I said 'majority' because I know there are some real sickos out there that would have done it any way just for fun.