Out of the four that are ahead of it, the Switch should have no probl ma passing the Wii and GBA.
3DS is going to be a tougher battle that I am not entirely sure of. I don’t think it’s going to catch the DS.
Reaching Gameboy and DS will be extremly tough, but beating the 3DS for a spot on the podium seems pretty feasible to me. Remember the 3DS was pretty frontloaded, I'm sure next year Switch will start outselling the 3DS in the yearly sales in Japan
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/