According to the documentation, the base reserve (0.5 XLM) and base fees (0.00001 XLM) are fixed, but over time they will likely be changed:
The base reserve and base fee can change, but should not do so more than once every several years. For the most part, you can think of them as fixed values. When they are changed, the change works by the same consensus process as any transaction
My question is, why would they want to change the fixed value / or what would be the advantage of it?