Not if motorsport will follow the current eco-trend in the automotive industry. We already see smaller engines in the WRC and rally cars have downsized (from Focus to Fiesta and so on).
Perhaps it is time to introduce a consumption limit for each crew per rally ? Sure it won't be the fastest driver who wins a rally, but the one who drives as fast as possible in a fuel-efficient way. It may sound a sacrilege for every rally purist, of which we have plenty on this forum, but it might safeguard the future and the very purpose of motorsport.
We already see in F1 that often it is not the fastest car & driver that is winning, but the car & driver combination that is managing tire wear better than others. Maybe it is time to see something like that in the WRC with cars & drivers using a limited amount of fuel as efficient as possible. A consumption cap may hurry the introduction of hybrid electric cars like the
Citroën C4 WRC HYmotion4 concept from a few years ago, that was supposed to use electric power only on liaison and road sections, while still using its 300 bhp petrol engine on special stages. And the auto industry will largely benefit from the development of these systems in this great lab called motorsport.