- Trade involving Bitcoin is increasing; trade involving fiat is declining (or at best static)
- The number of people using Bitcoin to account for their wealth is increasing; price inflation in fiat denominated goods/services/assets implies that using fiat to account for wealth is in decline
What makes you say that? The global economy grows with every year, there's no way that the trade involving fiat is static or declining, that only happens during recession years. While no one can predict the future of economy for sure, there's no reason to legitimately think that fiat economy is declining. Bitcoin trade is still so tiny when compared to fiat, the growth rate needs to become exponential in order for Bitcoin to get some significance.