For me before the Switch came out the worst I saw it selling was in the 80 to 90 million range. Having Pokemon, Mario, Zelda, etc all on one platform was going to move a lot of consoles.
Heh, well since around launch time I've believed it will be the best selling system of all time. Most thought my prediction was impossible at the time. Now, people see it as a possibility even if it isn't a sure thing.