Do those who study the Gita go to Vaikuntha or Goloka Vrindavana?

I heard in a class that Krishna never leaves Vrindavan, and that Krishna outside Vrindavan (like in

Dwarka) is a Vasudeva expansion of the original Krishna. Later on, in another context, I also heard that those who worship the Vasudeva form in Dwarka go to Vaikuntha, while those who worship Krishna in Vrindavan go to Goloka Vrindavan. Then what about those who worship Krishna as the speaker of the Bhagavad-Gita (which according to this principle is spoken by the Vasudeva expansion in Kurukshetra which is outside of Vrindavan)? As BG is a central scripture for Gaudiya Vaisnavas, the fate of a follower of BG must be Goloka Vrindavan; but then how should we understand the above principle?