Why? Why is it good to keep your savings in something which prime function is allowing commerce? Its better to have that money available for commerce than idling under your mattress.
Just put your savings in to something thats more suitable for it than credit money: Its not like you dont have a million things to choose from.
Make perfect sense, that is why we should spend fiat and save in bitcoin, you really don't want the same currency works both as a medium of saving and a medium of transaction
You want the medium of saving to be deflative to hold their value, and you want the medium of transaction to be inflative to stimulate spending and improve liquidity, a currency can not be both deflative and inflative at the same time