I guess that remains to be seen. My hunch is that it will go some way to achieving the aim of encouraging closer control and passing.
I certainly noticed a change in mentality - both from players and managers - when my lad's team went from small U10 pitches to full size U11 pitches.
The quality of football on display deteriorated (not insignificantly) at a time where it should have improved.
Ok, I accept there are many factors at play here, not just pitch sizes, but it's a significant contributory factor IMO.
The smaller pitches and teams seems to work in other (more successful) parts of Europe so I'm all for giving it a go.