Start a billiards program at a few public/charter schools. Get local boys/girls clubs involved, etc.
Give folks tax breaks if they put a table in their home/garage, etc.

Many school sports are club level, traveling programs, some (wrestling) are nearly year round. The same could be done with pocket billiards, as it is an indoor "sport." Unless the parents have a table in the home, many younger folks first introduction to the game is at a bar in their later years.
There are a number of things that could be done, but it will likely require a grassroots movement of some sort. I'm sure nothing I have posted here is an earth shattering revelation...just food for thought.