I think you're very right, in that public transit and land use planning go hand in hand. Density is very important, generating not only transit trips, but trips within themselves. That being said, when investing or looking at higher-order transits, the association isn't proposing any one type of solution. The retained solution is up to the local authorities, be it heavy rail, commuter rail, bus rapid transit.
We would expect, through accountability and process, that the retained solution would be what would most benefit the community in the short and medium term. That would accompany land use changes to support that higher-order transit that would be implemented so it could bear fruit.