i dont think that bitcoin can be considered digital gold :
1-gold since ever has held value even in financial crisis the gold still has value whearas bitcoin value is ever changing and can be (hypothetically) reach 0  in a financial crisis
2-gold is unique ,there is not other metal on earth that has the caracteristique of gold (thus came his value), on the other hand we have several blockchain project that outperform bitcoin (faster transaction,less fees,..)