Cryptocurrency has several desirable features, chiefly the ability to conduct transactions across borders with minimal middlemen.
Unfortunately the speculation applications of crypto are a pile of baloney and detract from its advantages.
Bitcoins days are numbered to when the sell-off "happens". It's inevitable there will be a few winners and many losers from it. Alternative crypto formats beat bitcoins design. The transaction speed of bitcoin is now so slow the sell-off/crash may happen before anyone knows it's happened.
Where retailers accept bitcoin for payment, what happens to the VAT on the goods (just one example where the outcome is unclear, and if govt wakes up to tax losses could clampdown on the use of the currency)