It isn't whether the bus service is passable or not, rather, is that the most efficient to reach the economic throughput to support the locals. Dense areas in the East deserve quality local rail access. I love your recommendation shared though!
If we both love your concept, do we have levers that we could pull to make it happen? I've read some of the ridership studies and recommendations GCRTA has produced in the past that have positive feedback for rail extensions. One of them for an extension past Windermere Stokes to connect to the Lake County border that was released over half a decade ago. We are nowhere closer to that extension than before the study was done.