LOL! Think of how unmanageable the game would be with even 1 million stars in it.
Keep in mind that not all stars have planets orbiting them. You can think of those stars with no planets as being there, but not having WPs as they are useless systems (except for hidden bases, but those would be minor and better in a Nebula anyways).
Se4 Risk will have a meta-map with all 70 sextillion stars. We are gonna use an actual map of the universe. Of course by the time it's done the stars will have all moved so much we'll need to revise the map.
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I used to be somebody but now I am somebody else
Who I'll be tomorrow is anybody's guess