Yes. The current system is horribly inconsistent. Currently some buses operate outside the zone boundaries. My town, Potters Bar, has one bus route, formerly two, that can use Oyster into London, but not on the rail, and is as close to London as Watford.
Hertford East will soon have Oyster, yet Hertford North (which is actually about a mile west and slightly south) will not.
So this will definitely place a massive pressure to have an all encompassing Zone 7-9 in other places, and hopefully, the extension of Oyster to the wider London commuter belt.
I know the government is waiting for ITSO and that's why they've been reluctant so far, but it's not happening any time soon, and Oyster is ready to go now.