Oil/gas wells are a depleting asset. All things remaining equal, your checks, in general, will fall perpetually. But you are also subject to oil/gas prices falling by over half over the past year. There are many factors affecting your check and you have control over zero of them. You have to be very careful, indeed, in trying to plan on anything regarding royalties. And it would be wise not to make any important plans without a professional evaluation of your property.