I'd be cool with season, as long as you also had some element of control with them. As fun as it would be, winter snow just wouldn't fit the feel of some of the towns, like Barnical Bay. And really, Sunset Valley feels too tropical to be to get snow either.
Still, none the less, It would be so funny if it started snowing in BB or SV. I don't know why, but even though it's a life simulator, it kind of bugs me when people want a more realistic game. I'm not attacking anyone who does, but to me, the "it makes your game more realistic" kind of annoys me. If season's does have its bugs and glitches, like it snows then it's super sunny, I will personally see it as something more realistic in a funny way, because that's how Seasons/Weather work in Michigan.
Like I said, I'm not trying to argue or flame, I'm just not into the whole "make it more realistic." I'm not talking little things, like how it bugs me when a Sim rocks out to Classical Music, or super needy babies, I mean bigger suggestions, some which are borderline inappropriate (on the official Sims 3 forum).
I still want evil toddlers to sneak out of their crib, scribble on walls, and climb on furniture.
I'll take your suggestion on CAS, although I'll kind of miss it since I'm a bit lazy, sometimes, LOL! I just wish they came up with more leopard printed options in CAS, because I can be so lazy sometimes. About Seasons, I'll take it, as long as it's not exactly the same as TS2 was. I said the same thing about Pets, got exactly what I wanted with pets, and now that statement remains with Seasons.