If there is a 'The Sims 5' what year should it be announced, and what year should it be released?

I've been through this 4 times already. Sims 5's base game would have to be spectacular to tempt me, especially since I know full well that the base game will feel restricted after a while, since I'm used to playing with extra packs. With both Sims 3 and Sims 4 I ended up playing the new game for a while, then going back to the previous iteration for quite a long time because I missed the extra content.