I don't think we are many years away from tackle football being phased out until a kid reaches high school.
Arguably the phase out has been happening through attrition already.
In the early '70s, I played in a Pop Warner type league (it wasn't part of the Pop Warner organization, it was its own organization) called the Vince Lombardi Junior Football League. John Harbaugh was playing in that league at the time and Jim started probably about the year after I left.
There were about seven teams and three were in Ann Arbor - the Junior Wolverines, the Junior Rams and the Junior Packers. I played on the Rams, the Harbaughs played on the Packers and Keith Bostic, who went on to be All American at Michigan and had a pretty good pro career with the Houston Oilers; he played in one Pro Bowl, played for the Wolverines.
Tom Minnick, whose son Jim is one of the Harbaugh's best friends, coached the Junior Packers. Coach Minnick ended up being elected Sheriff of Washtenaw County.
When I look for it on line, it looks to me that only the Jr. Wolverines are left.
I'm guessing parents aren't as enthusiastic to have their kids start playing full tackle football at such a young age nowadays.
EDIT: Check that; looks there are still two Ann Arbor teams, and they're both the Wolverines - the Blue Wolverines and the Maize Wolverines. The league still exists, or remnants of it, and is now named
The Downriver Junior Football League.
I recognize the names of some of the teams we played against back in the day - interestingly, there more Junior Football teams in the area, not less - although they're geographically more spread, it looks like.
So if there's a phase happening, it's going slower than I thought.