NASA keeps looking for long duration spacecraft. They have a -dandy- one already in orbit.
What it needs is a large ion thruster module. The ISS would make a really great long duration space probe. We already know that people can live on it for months at a time, and it's got many of the instruments one would want to explore deeper space than LEO. Flying supplies off Earth would take a whole lot less energy than launching an entire space probe.
Plus, it can be done incrementally. Attach an ion engine, fly ISS up to geosynchronous orbit, then fly it back down.
Seems like a much better idea than "Hey, let's burn this up in the atmosphere and count on the Government(s) to buy us a new shiny one."
It was thinking like that that led us to the Superconducting Supercollider -- oh, wait, we don't have one of those. But CERN has LHC, and they have studiously repurposed and refurbished their old accelerators since 1959.
C'mon, NASA. Think outside the box. For once.