Thankfully, he can't reach the balls yet without assistance.
The game has now carried over to the little girls. They often play pool on the toy train table, with raquet balls and whatever works as a stick. Here they were yesterday, notice Tori's little fingers holding the pool cue just the way she has observed.
I have looked for a small pool table on Craigs list that they can actually play; I think I need to keep looking.