The rule change allowing girls to now play grassroots football with boys right up until u16's, rather than strictly girls from u12 (i think) only will certainly increase the standard, and more importantly, the depth of the players coming through.
I do agree with one earlier poster though, although logistically harder to do as would be harder to share venues with their male counterparts, making the pitch size smaller and the goals smaller would increase the intensity and watchability of the games.