Just a reminder that SpaceX only exists because of ISS. Without the NASA COTS ISS Commerical Cargo demo contract in 2006, they were just another obscure space launch startup that had repeatedly failed to get to orbit. Without COTS and ISS, their commercial prospects were pathetic. And then they had the massive luck that their only competition for COTS (the technically superior Kistler K-1) ran out of money too quickly, allowing Falcon 9 to be very late on delivery and still come out on top.
Also, SpaceX already has the contract to deorbit ISS, and so any delay to the deorbit is likely because they are behind schedule.