Christian Horner admits he doesn't think Red Bull will "ever be able to repeat this season".
The all-conquering outfit won both championships at a canter and took the chequered flag in all but one of the 22 races this year. Max Verstappen claimed 19 of their 21 race wins as he broke numerous records en route to a third straight title that owed to an immensely dominant car.
Red Bull have blown the field away in the past two seasons and more than doubled the points of their nearest rivals Mercedes in the constructors' championship. The Silver Arrows are among several teams aiming to close the gap over the off-season with Horner accepting they are unlikely to enjoy such dominance again.
He said: "We know our opponents that this [their domination] will have motivated them more than ever to come back at us hard. Nothing stands still in this sport; everything moves so quickly. You can see as we weren't developing the opposition coming closer and closer.
"We have seen competitors coming closer at different venues and I'm sure concepts will converge, stable regulations will always concertina, so I don't think we will ever be able to repeat the season that we've had. But hopefully we can take the lessons from RB19 and apply them into 20 and come up with a car that we can defend these titles with."
Ferrari were the only other team to win a race this year as Carlos Sainz took victory in Singapore. They too want to challenge Red Bull as they eye a first drivers' championship since 2007 whilst Aston Martin are continuing to invest as they look to join the party.
Mercedes chief Toto Wolff is ready to oversee a massive overhaul as they take a chance on their design for next season. "We are changing the concept. We are completely moving away from how we laid out the chassis, the weight distribution, the air flow," he said.
"Literally almost every component is being changed because only by doing that I think we have a chance. We could get it wrong also. So between not gaining what we expect, to catching up and making a big step and competing at the front, everything is possible."
Lewis Hamilton is concerned after the Red Bull flew into the distance in the season's final race. "At this moment, I don't really know [about next year]. For Red Bull to win by 17 seconds and they haven't developed their car since August is definitely a concern," said the Brit.
"We have learned a lot about the car and it's just down to the team now. They know what they need to do. Whether or not we will get there, we will see."
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