You set up your wallet software such that it automatically spends the last earned coins, which makes it a wash generally (or yields a small gain for which you need to pay taxes and be happy that you get to keep about 60-90% of the purchasing power that would have been 100% lost to inflation in the case you had been using USD instead of Bitcoin). This is similar to using currency.

If you are spending more than you earn, then your wallet spends the coins that were accumulated earlier, in which case you suffer a larger tax hit. This is similar to selling your investments for profit, and paying taxes.

Can someone else explain why this is the end of Bitcoin because I fail to see it?