The issue as I see it is not around storage (keeping it safe) or even being able to freely spend it, but its value when compared to cash.
You work and get paid, simple. The value of what you have been paid sits in "cash" that has today a buying power, that buying power does get eroded over time by inflation however in recent years that erosion has been less than a few percent. Whilst interest rates on saving today are almost nothing you can offset some of the erosion with an interest return.
In simple terms then, you know pretty much month to month and year to year where you are.
Bitcoin though has an incredibly volatile structure.
If you swap £10,000 into Bitcoin today it could be worth £15,000 next week or even £5,000. It would make sense if you swapped and spent the money almost simultaneously, but nothing else.
Whilst recent increases in the "value" of Bitcoin have been cheered by some, it simply enforces the argument that it is an investment - no different to gold, shares or even wine.
It will only become more mainstream when it doesn't fluctuate, perhaps moves no more than 5% a year (similar to an average currency pair in a normal year).
After all, would you work hard for a month and get paid only to see your wages half on pay day....
