Storage space tends to grow exponentially over time (and will certainly keep growing super-linearly), while the blockchain size grows only linearly. So that's not a big concern.
I was going to post something related, which was when I tried bitcoin for purchases, the whole thing involved way too much faff and was too slow for everyday use. Maybe for some purchases but not for everything I might do online. I guess if you had an account in bitcoin but then you're back to banks etc which might defeat the purpose slightly.