Ok, let me ask you this question. If you have tied your fortunes to bitcoin and your life depends on the profits you make operating bitcoin based business when will you support transactions in alternative competing criptocurrency and 'interface' your system with theirs?
No but you'll fail since you'll be economically inefficient compared to people who do.
You are both right. And that makes it easy to pinpoint when bitcoin will really take off: when any bank dealing in bitcoin is blacklisted from the IBAN(?) transfer network, or something to that effect.