Get to Work has already lost some of its original value by having Photography skill brought to the base game. If we'd bring the alien life state to the base game, you'd remove one entire key point from the pack. If we'd add new more improved alien life state, you'd just make the existing ones more inferior and less played, also removing value from Get to Work.
Expansion Packs should have a more wider focus while Game Packs should have more focus on one thing. That's why we're getting complaints that "X ep should have been a game pack". Not to mention that pumping out more and more expansion packs just reduce brand loyalty, which is especially important as The Sims is finally getting some competition (EA is making a good move there by releasing older games). Do not take Get to Work features and separate them into separate packs. Not everyone likes spending their money.
I kind of miss older The Sims expansion packs as you can see...