This just made me think of something - would it be accurate to say that the speed of light is getting slower over time, when measured over insterstellar distanc

This just made me think of something - would it be accurate to say that the speed of light is getting slower over time, when measured over insterstellar distances? Speed is distance over time, and distance is measured by a landmark in this case. In a hypothetical world where an observer has only a distant pointlike object as reference, and he measures that the time it takes for light to arrive from the object, would it not be equally valid for them to assume that the distance is increasing, or the speed of light is decreasing? Would it be possible to say that light suffers from 'drag' over large distances thereby further objects appearing to take even longer to get to than it would be proportional?