The space station would stay in orbit quite a long time without being boosted, that only happens once in several months. Based on past experiences, it's possib

The space station would stay in orbit quite a long time without being boosted, that only happens once in several months. Based on past experiences, it's possible to salvage even badly damaged space stations. This has been done before in the US Skylab program and the Soviet Salyut and Mir programs, although never in the same scale as the ISS. Skylab had problems with solar panels and heat shielding which was fixed by spreading a huge blanket of reflective material. In one of the Salyut programs, there was a loss of power which caused the station to freeze over. It was eventually recovered by cosmonauts who entered the dead space station wearing gas masks, and slowly melted the water reservoirs and eventually recovered the station. The Mir station suffered a bunch of problems, including an onboard fire and a collision with an incoming supply vessel. The station persisted despite all these issues as well as the fall of the Soviet union. In the case of a serious accident on the ISS, some kind of contingency plan would certainly be improvised. The exact details would depend on the damage, but it would most certainly not be abandoned without serious attempts at fixing the issues.