Okay, my proposal:
No one knows where the Time Matrix is in the 'true' timeline. And besides changing history, the Time Matrix can get you anywhere or find anything. All you have to do is think it. Ultimate weapon.
Obviously, Ken'atra beat our characters to the Time Matrix.
Our characters, if we find its location as well, can be used as wild cards; transplanted from the ended timeline to the normal one. Wild cards who know where the Time Matrix is.
Could be interesting...what do you guys think?
(Of course, this would limit how long-lasting this would be.)