Yes but why would you do that?
Not having to log back on when I suspect I could be gone for longer than that - for various reasons
The point is to disconnect the people that totally forgot their game was on, and halp with ENY issues.
I suspect that few actually forgot to log off. For example when they recon their side is about to win the war, they may just stay online to collect their 75 perks (which is a lot for the ordinary player)
And about those who actually did forget to log off - I'd guess that's about the same percentage on all sides, thus it would have little impact on ENY at all.