So in theory we should get as much content in upcoming DLC's as the base game provide.
In practice we already see first reviews, people whining all over the forum about how short Automatron is.
So yeah, days where $10 DLC were like that are long over now Bethesda. You got some serious competition comparing to other companies DLC size. Such as CD Projekt Red
Or most recently expansion for half of the price what F4 SP is asking for Dying Light which gives u basically a whole new big map with lots of stuff to do.