What I'd like to point out is that while like you I'm also skeptical about having a majority academy team (i personally believe its increasingly beyond any team who wishes to be best in the world) but we are without doubt the number one in the planet for investing in an academy and youth. Definitely exciting times ahead, and looks like we might change the DNA of the england team while we're at it
I actually do think it's very possible to have a majority academy team (especially for a club like us who will scour the globe for the best kids) because it basically assumes 1 player every 2 or 3 age groups makes it as a starter.
If you look at Barcelona's homegrown 10/11 team there were 8 academy players starting every game:
Puyol born 1978
Xavi born 1980
Valdes born 1982
Iniesta born 1984
Pique, Pedro, Messi born 1987
Busquets born 1988.
For the most part, ignoring the 1987 golden generation, you've got 1 player every couple of years making it into the 1st team.
So ask yourself if any 1 of our current 1999's (Brahim, Francis, Kigbu, Diallo, Dele-Bashiru) or 2000's (Foden, Rosler, Sancho, Poveda, Wilson, Latibeaudiere, Garre, Gonzalez) could get in the side?
I think everyone at the club would consider it a catastrophic failure if none of those names made it here long term. Any one of those could be our "Puyol" in a majority academy team 10 years from now. And then one from the 2001/2002 year group and so on.
Now Barcelona would have given 100 youth team players debuts in the 10 years between Xavi's debut and Busquets' debut, and only 8 made it into the first team for that 2010/2011 season, but at that point there were 8 starting players from the academy - the team was majority La Masia players. Some of those kids given debuts would have only got 1 or 2 caps, others would have got 100 caps but fallen away before that 10/11 season, but if you put in place a strong academy and managers who will use the kids, over time this can happen.
So it's really just about consistency over a sustained period.
In fact we could have already started if any of the 97/98 generation make it - Iheanacho, Maffeo, Angelino, Tosin, Garcia, Gunn etc.