Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150604030859/@comment-28917471-20150604073013

Well... the Emperor would take over most of the Galaxy, spreading the Imperial Truth to ever corn of it. The Imperial Webway project would be complete, and the imperial armed forces would be able to move safer, if not faster through its mysterious corridors (though the eldars would still pose a threat to the imperial webway travelers). There will be no need for the astronomican anymore.

The Imperium would be much more better secured and protected. I am not sure what would happen to the Primarchs, but I think that the best thing that the Emperor could have done is a mind-wipe, or to put them all in the statis-fields (if their military guidence would be required in the future).

A lot of gifted generals, diplomats, administrators, iterators and remembrancers would be left to manage the Imperium, just like the High Lords of Terra would be left to run the Imperium.

The Imperial Truth would allow humanity to advance further, technologically, socially and scientifically. This would leave a great mark on the Chaos Gods, as the order of the realspace would decrease the flow of emotions and thoughts that could strengthen the Chaos Gods, though they would still be able to interact with the material realm (and this is where the Inquisiton would come in).

With the help of the Imperial Truth, the psychic powers and finds of ancient technollogy could be better understood.

This Imperium would be able to better defend itself against future enemies like Tyranids or Necrons

This is my brief opinion on how the future of the Imperium would look like if the Great Crusade would succeed.