I would wager to guess that the show will end after this season. It's hard to imagine it continuing without Mr Lahey, it just wouldn't be the same.
I've enjoyed these new seasons from netflix since they brought the show back a few years ago, but I really don't think they've ever come close to matching the first six seasons. When I want to watch the show, the episodes from the first six seasons are what I gravitate towards. Thats prime TPB!!
And I would really place Mr Lahey as one of the greatest television characters in the history of tv. And his portrayal of somebody being drunk, is without question, the best in the history of acting as far as I'm concerned.