Gimpo's transportation is a living hell, yet it's just making neighboring areas better.

There is already a high supply of apartments around Gimpo Hangang New Town, Pungmu, Geolpo Bukbyeon, and Unyang Station, but they are adding another 83,000 units in Hangang 2 New Town + Gimpo Ara District (Gochon) ㄷㄷ
The roads leading out of Gimpo to Seoul are narrow, and since they overlap with Incheon and Bucheon, the traffic is a total nightmare. If they cram another 83,000 units in here, we might have to just give up on transportation. Even if the Gimpo Line 5 extension happens, it probably won't matter much since the Geomdan New Town route will be added in the middle.
On the other hand, the Unjeong and Ilsan areas right above it have the GTX and well-developed highways, and once the Second Metropolitan Ring Expressway opens next year, a trip that took 50 minutes will be cut down to 15 minutes. While Gimpo is doing all the work to benefit others, its own transportation situation is heading toward the worst.
Once that highway opens in Unjeong, they can even reach Incheon Airport in under 30 minutes. This is bad news for Gimpo.