As population in Whatcom County keeps growing and detached homes with yards remain popular, we have a history large new subdivisions being proposed. I just learned about a new one called Semiahmoo Highlands.
Many of these proposals, in the past, haven't been built due in part to strong opposition as well as things like the housing bubble burst of 2008.
Where Hundred Acre Woods is, in south part of Bellingham, was once proposed to be "Chuckanut Ridge;" a large housing development. Balfour was another one out Mount Baker Highway. Larabee Springs, north of Bellingham has been scaled back at least. Parts of it are there, but that big development wasn't built as originally proposed.
I think our aspirations need to turn toward denser development which is often fought as well. Reducing worldwide population growth matters as well.
Some of the new developments do plan some density, like townhouses in the mix. Bike paths and parks in the mix, better than the older developments, from decades past like the 1950s, where so many people live today. Some of these older neighborhoods are being retrofitted with trails and other changes.
Still, the future and affordability of single family development is in question for sure; especially in popular areas.