Red Bull advisor Helmut Marko believes the chasing pack has "no chance" of catching Mercedes, adding that Ferrari haven't really made up ground on the pacesetters.
The Brackley-based squad's performance in Australia saw Red Bull urge the FIA to use an equalisation measure to reduce the gap while F1 boss Bernie Ecclestone also wants things to be "levelled up a bit".
Mercedes claimed another 1-2 finish at Melbourne last week and their closest challengers were Ferrari with the third-placed Sebastian Vettel more than 30s off race winner Lewis Hamilton's pace.
Marko, though, says Ferrari haven't really closed the gap and says the rest of the pack won't catch Merc any time soon.
"Ferrari's performance must also be seen relatively: they are not closer, they are just better than last year," he told Speedweek.
"We at Red Bull do not believe that, with these restrictions in this form, any other manufacturer will ever catch up with Mercedes.
"If you do not have that engine, you have no chance at the moment."
Marko has also revealed that Red Bull could quit the sport if owner Dietrich Mateschitz loses interest due to the current level of competition, or lack thereof.
He insists that everyone needs to vote in favour of changes before anything can be done.
"The crux of this whole power unit problem is that it was decided to freeze the development. Whoever found themselves behind in preparing for this (turbo V6) concept has no chance of ever catching up," he said.
He added: "For quick changes, unanimity is required and changes in 2017 require a majority vote. Mercedes has four teams, which is the highest number, so no majority decisions can be achieved against them."