Debate fuels my Fire
GW wants their games to become multimedia franchises. They don't want to sell only miniatures, but also videogames, comics, novels and other products. But with the W40K if I sense the feeling of "I am surrounded by stupid!", the characters like the space marines are very powerful in the battlefield, but intellectually they leave much to be desired if we compare with others from other franchises.
Some reboots work, sometimes even better than the original ones.
The old warhammer could return, at least because they are making with the Total-War videogames.
* The time travel is almost canon in W40K. This means there is a open door if it was necessary in a future.
Old Warhammer is returning, GW has literally announced an "Old World" product that brings back square bases (and base trays) in the vein of the pre-AoS game.
No timetravel is required, as it will be set in the Three Emperors period of the Old World.