It's like economies here might be tanking, people are losing their jobs, Covid 19 is buggering up the west in multiple ways but in some parallel fantasy universe, Playstation will double its sales this gen even when games here now cost 80 freaking euros.
I'd politely say it's unlikely but everyone has an opinion etc.
I can see a console doing 200 million if the competition completely tanks and you're the only one in the market. Both PS2 and NDS were in that situation and did 150 million. And I'd say the market now is bigger than it was back then.
Even so, I don't think Switch sales will slow down all that soon, and I doubt Xbox is gonna drop the ball as hard as they did last gen, so... doubtful.
I'm sure the PS5 will do a great and I can easily see it do 100-150 million though.
I also don't think they can beat PS4. In 2013 they had absolutely no competition because of Microsoft's mistakes and the price advantage and Nintendo was dead at that time. Now they have two serious competitors and neither the cheapest nor the strongest console.