Bitcoin is never going to replace the £.
Yes, and PC word processors would never replace typewriters, and email would never replace letters, digital cameras would never make film obsolete, online video would never kill off high-street video rental. Yes, very good that we have all those long-standing things still with us...
Erm...all of those things
are with us. I just wrote someone a letter the other day, with a fountain pen no less. And I'm not joking.