The new red line will service DMK.
The Green Line extension was planned years ago, the taxi mafia is not as powerful as you've been led to believe, nor do they influence mass transit routings.
Remember, DMK was supposed to be shuttered, permanently, and the RTAF would "develop" the land.
For the most part, mass transit lines follow existing roads.
Pretty sure you're asking about Wat Phra Dhammakaya?
Controversial, in more ways than one.