Being realistic, none. But if I had to bet one, Tencent is the only one who could have the money and interest on doing so only if PS considerably grows and ends becoming 'too big' in China.
But consoles for Tencent is a relatively small market and they always supported all platforms and markets, so I think won't release a console. If something they make consolized PCs like Valve an MS.
I think Google or Apple could improve their support for paid games & games controlled with gamepad games, and to give a more console gaming focus to Apple TV or Google Chrome & Android TV, also supporting their own or external cloud gaming for AAA games there. But in both cases I think they'll continue prioritizing their existing gaming business focused in F2P and casual they already have mostly in mobile (more successful in userbase and revenue than consoles).
To stop making games for other platforms would destroy most of their revenue and profit. Same goes for the other 3rd parties.
AAA games, and particularly the GaaS ones, need to be able to reach an as big as possible userbase. So in recent generations the AAA companies have been expanding their multiplatform side and reducing their exclusives side. A trend that will continue because as always AAA games will continue getting more expensive the next generation.
Fun fact: in the 90s Capcom did an unsuccessful console: CPS Changer, the only platform that allowed you to play 1:1 versions of their arcade games at home, since basically the cartridges were pretty much the same arcade games. A pretty similar approach to the -less unsuccessful- Neo·Geo concept:
