Similar to what Unamis76 said, I will only comment on the last part since I have never taken the 52-week challenge. If I were to choose between saving in fiat vs saving in BTC, I would always go with BTC. Although the currency is highly volatile, it most often takes currency's value up rather than bringing it down. This is because the number of BTC users is on a constant rise, which ultimately results in value appreciation of the currency. on the other hand, fiat only tends to decrease in value over time. so for me, its Bitcoin over fiat any day.
Yes. The fact that there will be no more addition to the bitcoin number defines it all.
If there is a growing popularity into which one wants to own a part of it, it becomes more valuable.
One example is gold, although they can still mine it someday it will be depleted. That makes it valuable.
Saving thru bitcoin is the most wise decision for me. Thinking there will come a time that every satoshi will count. This 21 million bitcoin will not be enough for so many users. Subtract the ones that are lost.
