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That sounds entirely probable?

If banks actually adopt it, why the hell not

Would be nice, but I don't think banks would purchase ripple on the "open" market. But just straight from ripple labs, at a discounted price.

They are all working on coins of their own, a Japanese bank launched its own coin yesterday... so that's where were headed, what with the SWIFT consortium working intensely on creating an alternative to Ripple - banks don't accept outsiders IF THEY DON'T HAVE TO, because they need some bailing-out. So in that connection you might be correct about the discount ;)
In fact however, banks couldn't care less about the price of Ripple as they needn't buy it, only use it. It is a transfer token.

if "banks adopt it" that means we are analysing based on "NEWS" now, not TA, and honestly, i find it a bit exagirated , 500 marketcap? the entire crypto is fighting to hit one 800 for a year now, that means if ripple hits 600 billion, Bitcoin should be at least 2 trillions....

Exactly, that would mean that whole market cap is about to crash.... I mean there is possibility that it will reach that price , but right after we are going to crash hard.... Maximum market cap for crypto as we see it's 5trillion which is about 5% of global market cap, at this moment a lot of regulation , and stupid money will go away.... It will be massive crash before major companies in cryptospace will estabilish for good.

Elliott was a clever man who however did not create the universe. EW principles apply, but exotic happenings can entirely delay them in the time axis, or make them come undone.
For example, I doubt that the market would survive a nuclear war or an asteroid hit, though @haejin might observe that in the end, human psychology remains the same - oscillating between greed and angst.
While what we're witnessing now is just lots of additional waves being generated along with fear and loathing for a month, and then all simply resumes - as @haejin likes to say, the overall count will remainss the same.
As to market cap, it went up by about 1500% last year. Let that sink in.

The whole market cap will grow just like every year, it was only 25 billion total in 2015. Theoretically makes sense.

R.I.Pple the company doesn't even use XRP in their systems.