Why is it taking so long to merge both the Werribee and Sunshine rail corridors into one via Wyndham Vale Station?

Having merge these 2 rail corridors we could improve travel and frequency times for both V/Line and Metro by assigning Wyndham Vale, Tarneit and that future railway station in Sunshine for more frequent electric trains. V/Line would benefit greatly by only having Wyndham Vale Station as its stop before Little River, saving at least 5 minutes.

This project should've taken precedence even before Wyndham Vale and Tarneit experienced a population boom. Many residents at both stations are fed up with less frequent trains.