Formula 1 needs rule changes to make it less predictable, says Red Bull team principal Christian Horner.
Lewis Hamilton won the 2014 and 2015 world drivers' championships from Mercedes team-mate Nico Rosberg.
Mercedes won the constructors' title in both years, finishing first in 32 out of 38 races and completing 23 one-twos.
"People get turned off with predictability. It needs a rejig to bring it closer together," Horner told Autosport.
The Red Bull boss said it was up to the sport's senior officials, including commercial rights holder Bernie Ecclestone and FIA president Jean Todt, to find a solution.
"The regulations are incredibly stable for next year, so Mercedes will inevitably carry on the dominance, such is their margin," he added.
Horner believes the situation is different to when Red Bull won four successive constructors' championships and Sebastian Vettel the same number of drivers' titles from 2010 to 2013.
"Two of our world championships went to the last race, and we never finished first and second in a championship," he said.