Misinformation and hype.  This is typical of every pump and dump.  The "banks" Ripple is working with is largely only Fidor and Fidor's is embracing all crypto currencies and it's by no means a large bank (not even medium sized).  The rest of the 'banks' are just people having free discussions or eating banker's lunches.  Definitely nobody would even dare to convert their entire banks' system onto Ripple (not even 1% of their system).  

As well who needs Ripple when Ripple can be forked and copied as per Stellar example?  Cheaper for the banks to create their own Ripple and cut the middle man out.  There's plenty of Ripple employees who are probably disgruntled to be making only $80K a year, while the boss is buying new Lamborghinis, and will work on any Ripple fork for a slight pay increase.