There is nothing wrong in having an experienced campaigner in the side, especially for high pressure matches.
Remember, it was Tendulkar who majorly won us the Australian tri-series. And if these two can still contribute, then why to ignore them.
And the WC can still be planned, without banishing anyone. Already the IPL has increased the pool of cricketers, to pick. But like I said, having atleast a single senior would not harm but would only be beneficial.