Thanks for the answers.
I know that Bitcoin by his nature is completely the opposite from what the Banks represents, and still, as Bitcoin getting stronger over the years and Banks beginning to understand his open source technology, I believe that they will use Bitcoin , maybe 5 + years from now or even tomorrow, to reduce costs and transfer big amounts of currencies between different countries, its an easy/pseudonymous/fast/cheap way to transfer any amount of money, I believe that any Institution that holds Capital in any form or way, will use Bitcoin in the future...
I really don't think that financial companies will use Bitcoin. I think they will use the blockchain technology that is used by all the crypto currencies (e.g. Bitcoin, Etherum, etc.) Bitcoin doesn't need banks to get widespread, but banks needs the technology that Bitcoin has and has been developed. Based on this technology, banks can develop a similar blockchain technology not in 5 years but in 1 or 2 years time. They're really on it now, because you can find headlines about it.
I'm wondering if banks succeeds to implement the blockchain technology in their system, normal people would notice anything about it. Maybe they will just notice that the transactions complete faster than before.