I think it's not very intelligent measuring BTC "profits" or "losses" in fiat in longer term because of inflation.
The possibility that Bitcoin becomes a dominant currency should not be ruled out, too.
The only reason BTC profits and losses are measured in fiat by most people is the current dominance of fraudulent fiat monetary systems which only work because of mass indoctrination and coercion by governments. Anyone using his or her free mind would not accept and use fiat money.