Misterg
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I think Elon Musk has offered to nudge it into a more sustainable orbit
By design, the ISS is really only just at the edge of space, so suffers significant atmospheric drag. It has already been moved to a higher altitude to prolong it's life without Musk's involvement.
It receives regular altitude boosts - formerly from various spacecraft like the Russian 'Progress', the Space shuttle and ESA's ATV Johannes Kepler, and more recently from the Northrop Grumman 'Cygnus' craft as shown by the altitude graph that @voipio posted. This is sustainable for as long as these are sent up (which is necessary anyway to keep the ISS residents supplied). The ISS also has some (limited) propulsion on board. The decision to de-orbit is an engineering one.
The solar arrays have already been upgraded (at least twice), replacing the original silcon cells with higher efficiency gallium arsenide ones.
The current crew service vehicle for the ISS is the Dragon capsule built by SpaceX which is owned by Elon Musk. In theory this could be adapted for re-boost, but I don't believe it currently fulfills that function. (There is also the Boeing 'Starliner' that is undergoing testing at present.)
NASA has also awarded the contract for a vehicle to de-orbit the ISS to SpaceX. who have said that they'll use a souped-up version of the Dragon capsule to do this. The whole point of the de-orbiting is to arrange a predictable trajectory for the remains such that they drop into the middle of a big bit of ocean.
SpaceX's vehicle to deorbit the International Space Station is a Dragon on steroids | TechCrunch
NASA was looking for proposals that maximized the use of flight heritage because reliability will be key.
techcrunch.com