Connections have previously revealed a potential European campaign, including an appearance at Royal Ascot, is under consideration for next year, but Waller is keen to enjoy the moment.
He added: "Let's get through today. She'll only go if she's still at her very best.
"She's an animal that we love and horses come first in this sport. I wouldn't make a decision until at least March.
"We'll talk about races and any questions people want to ask I'm willing to answer them, but we won't get serious until about March."
Humidor ran a fantastic race to finish a close-up second just a week after finishing fifth in the Caulfield Cup.
Trainer Darren Weir is now looking forward to a tilt at the Melbourne Cup on November 7.
Weir said: "I thought he ran great. He's had a really good week.
"The plan was to go back and ride him to be strong through the line to see whether we can push on for a Melbourne Cup.
"Halfway down the straight, I didn't know what to think really.
"He ran great, the winner was too good, and the scenes here are amazing.
"There's a lot more to come from our horse and I hope we'll go for the Melbourne Cup now, providing he has a good 10 days."
Charlie Appleby's British challenger Folkswood was a highly creditable third under Kerrin McEvoy.
McEvoy said: "He ran really well. He was a little bit slow to step, but I got into my preferred spot and we had a nice time of it.
"The leaders stepped it up at the half-mile and I increased (my speed), but unfortunately the wondermare was right on her hammer at the 500 (metre mark).
"My fella batted on well and that was a personal best for him to finish third, so you couldn't ask for much more."