Even if 95% choose mobile, the world is big enough for the niche console gamer.
Sports cars and muscle cars were written of dead decades ago, Mustang Corvette still going strong. Supercars are selling more then ever. All auto companies are bringing back fun fast RWD sporti cars. Corolla sales 400k, Camery 350k, Frs/Brz 30k
So no worries Consoles will still be around. Some one will always look for a market to sale a product in.