I wouldn't say "about to" but its popularity will steadily grow. Most towns and/or schools already have a soccer league, bringing up the next generation of soccer players and fans.
However, as another poster mentioned, the schedule of a soccer game doesn't fit well with American advertising practices, and networks are always loathe to change.
It's a cheap exercise program for schools. Most kids out grow the notion that soccer is "exciting". Because other countries embrace soccer, is just meaningless. Other countries embrace socialism, does that mean the USA should also? Soccer is painfully dull to watch and will NEVER be a "major" sport in the US.