TOKYO— Toyota Motor Corp. is plotting a road to near extinction for its conventionally fueled cars as the industry grapples with the fallout of Volkswagen AG’s diesel-emissions scandal.

The world’s best-selling auto maker said Wednesday that by 2050, gas-electric hybrids, plug-in hybrids, fuel-cell cars and electric vehicles will account for most of its global vehicle sales, without giving a detailed breakdown.

That means gasoline- and diesel-engine powered cars, currently accounting for roughly 85% of Toyota global vehicle sales, would be near zero, Senior Managing Officer Kiyotaka Ise said.

“It wouldn’t be easy for gasoline and diesel cars to survive,” Mr. Ise told a media briefing in Tokyo. “With such massive decline in engine-powered cars, it’s like the world is turning upside down and Toyota has to change its ways.”

Toyota’s vision highlights its bet on hybrids and fuel-cell vehicles as pollution concerns grow and auto makers compete to identify what could be the dominant next-generation technology to power cars.