If I had bought a portal I would be disappointed if they offered a standalone device so soon. It would feel like a bait and switch.
I’m all for them offering the best products they can at any point in time but it would feel like they started with a gimped starter model so people who upgrade end up buying both.
I feel the same way about EA, they did The Simpsons Game in 2007 for Nintendo DS, Wii, Xbox 360, PS2, PS3 and PSP.
Then The Simpsons Tapped Out for mobile in 2012/13.
Since then they have done nothing with the license for a decade ?!