The movie tries to avoid a lot of questions about the Blight issue. However, I think nothing supports the idea of blight as a "natural disaster". Remember that blight is attacking not only food providing plants, the Earth is about to lose its oxygen due to it, Murphs generation is predicted by Prof Brand (Amelias father) to be the last one surviving on earth as people will not only starve but also suffocate.
Now, seriously - dinosaurs did not suffocate, alright? A disaster like that will kill not only humans but just every single oxygen breathing animal - the entire fauna on the planet, an event singular in Earths history and as such plain obviously not a natural one. This is a seriously messed up planet, biosphere destroyed severly (yes, by humans) before Blight was starting to thrive so massively, toppling a millions of years old natural balance that controlled Blight previous to the events in the movie.
The movie tries to avoid these issues, tries to steer away from having to thematise those ecological-political topics for reasons that are impossible for us to know but if you count 2 and 2 together you realise this is not a natural disaster. It's a scifi movie that is however written in a way to avoid too obvious scientifical glitches and assuming earth would out of the blue experience loss of oxygen after stable millions of years would just be not very scientifical.
In a space station that supplies the plants with a healthy atmosphere as on Earth before its natural balance toppled, remedies for the plants will work again. On earth they did not (or not for long as the plants died in stages - Tom started to reglarly lose 1/3 of the corn harvest 20 years after the Endurance embarked on its journey). This is a development, it's getting worse step by step but yes - it's shown in the movie that they are working on means to control Blight as pointed out in the answer and comments above (NASA facility, the bio lab). Those means however can only slow the process down a bit and not for long.