What are u saying mate?? Isn't this the argument given each time when India makes a generational leap in development?? This was the same argument given before the Delhi Metro came up, people used to site terrible condition in which Kolkata metro was, but now Delhi Metro is only one of the world's two metros that are in Operational profit, as much as 10 lakh people travel by Delhi Metro every day, such is the success of it that by 2020 it is projected to get pass the London Metro in total track covered.
Look it this way, there are people who are willing to spend money, but wants to make the journey as fast as possible by train, if there were no such people than all Indian trains AC classes would have remained empty. They are getting the comfort in AC class currently but are not getting the speed, these high speed trains will fulfill these gap, besides it can be helpful in attracting tourists as well.
As far as Dedicated freight corridor is concerned it is also under construction, we have to work on every development project in parallel & do not have to make every thing dependent on other.