Beware of making overly confident premature predictions.
Back in 2017 the idea of Switch outselling the PS4 was considered far-fetched to the point of being laughable, yet now there's a very real chance it could happen. Likewise, for all we know in 3 years time we could be laughing at the idea that people ever ruled out the idea of PS5 outselling Switch.
The gaming industry is highly volatile and you never know how things will turn out.