Bitcoin will never make it but the technology behind it will, eventually.
Bitcoin is the most well developed cryptocurrency. It's posible that someone may in future produce a better design, but no-one's doing it now.
Also, your scenrio is biased: yes, if you use that specific app, a $60,000 dollar price would make it unusable. So just use a payments channel based app, fees are then flexible enough ($60,000 BTC price is a
great problem to have, isn't it?)
- 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.
Officially stated growth isn't outpacing inflation. That means de facto low or no growth in trade. And the actual growth rate might be lower than the official published figures. They're unlikely to be lower.