I am going to cheat and combine up to four of the options in this poll:
The Sims 5 could be better, if they allow some expansion features in the base game
The Sims 5 could be better if they add open world, color wheel, CAW, (sims 3 ideas)
The Sims 5 could be better if they add better personalities, memory system, story album, chemistry/romantic system (sims 2 ideas)
The Sims 5 could be better if they add more parody and humor, details, and a more witty style (sims 1 ideas)
So in other words, the best of The Sims 1, The Sims 2 and The Sims 3 but absolutely NO online of multiplayer game play!
