The more time pass, the more chatter there will be about Switch 2. Switch will slowly decline and with the price rumors, i doubt Nintendo will keep the Switch around much after the successor. They don't seem to want to cater to a low low price demographic they used to target with 2DS, Wii, etc. They kept the 3DS around bc it was different from the Switch but i do suspect they will be more similar.
So i do think PS5 will outsell the Switch overall. It will be a closely led race by the Switch but PS5 will take over in the fall.