"We've got a style of play that will continue to evolve," Fisher said. "You just roll up the sleeves and keep working.
"I know there's a quality group of players and a quality group of coaches and staff who are still here, so I'd expect the team and the organisation to prosper."
Mowen will head to Montpellier shattered not to have won the title.
"You can't have it all, even if you'd like to at times," he said.
"It's a little bit tough to take at the moment, to be honest.
"I'm just really disappointed, I really feel like this side deserves some sort of finality, a championship, to this period and that's still there for them next year.
"I just really felt that the work we'd done developing the game, the development each of the players had, that it would end there and I couldn't see it not ending there, to be honest.
"But we've said all along that deserving it and making those things happen are two different things and the Waratahs came out and made it happen."
Despite his dejection, Mowen also believes the two-time Super champions are on the cusp of another special era.
"As long as this side is together - and next year the majority of the group is much the same - as long as they get some sort of reward for the work they've done, I'd be very happy to see that," he said.
"I almost want to ring Laurie and say: 'Mate, don't go over, we'll go to pre-season next week and get stuck back into it'. But that's our time done.
"I've loved every minute of it. Loved showing up to training, loved the tough days, loved the wins, the tough losses, the rollercoaster that it's been."