Well as far as I know X already tend to grow since Bitcoin introduction and it's a big point of discord between developers ("should we increase block size" argu

Well as far as I know X already tend to grow since Bitcoin introduction and it's a big point of discord between developers ("should we increase block size" argument as far as I know). Now to be more accurate it might rather be a growth according to a logistic curve. Right now Bitcoin is used only by early adopters, but should Bitcoin usage diffuse among general customers it will growth quasi exponentially before plateauing.