Well there is a limit of mining, every new digit is 16 times harder to make, there are just 2 or 3 digits left.

This was made with growth and inflation in mind so the currency last like 60-80 years but they didn’t predict giant farms using entire powerplants of energy, so basically 50 years of bitcoin was shortened to the last 5. The thing is profitability as miners have to make an entire 28 bit hash at random wasting dozens of GPU in exchange of less money of what they cost so the prizes must be risen even more making it even more centralized (also lowering the price for every other holder)

This is almost poetic As bitcoin approaches its end only the top miners are allowed to continue increasing the risk of the death which is 51% attack, if some of the final miners will unite and reach 51% at this point they can cash out the entire currency and make it look that the price falls to zero.