If we have a Sims 5, should seasons, vacations, and pets be in the base game, instead of in a pack?

I would love to have all this and more in base game, but I fear for the price of the base if they do. I know it ends up costing a lot when they put them in expansions, but I don't have to pay for it all at one time, I don't know if I could afford the price they would charge if it was all in the base. Still would be interesting to see if they could do it.