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If ripple would be 1000 USD, the market cap of ripple would be higher then gold! So don't dream. Max for ripple is 15-20 USD in next 5 years. Why nobody cares about supply of coins? Do you do some research? Bitcoin have big price not because keeps buiyng it, but because the supply is limited – 16 millions bitcoins are available today. For ripple – there's 100 billion coins!!! available! So do your 1+1 :)

By 2030, this will be the USD:
zimbabwe-100-trillion-dollar-bill-obverse.jpg

I read it at some forbes forcast story i think... it was like where BTC, ETH, ripple etc. could be at the year 2030... There BTC was predicted at 200 000 $ :) I think + hope that this is just the beginning and more and more money goes in cryptosurrency.

Technically, Ripple also has limited supply. The overall quantity of XRP does not increase; they are already pre-mined, remember? It's just that the Ripple company is holding rather big chunk of the supply, and they are planning to gradually release them into the circulating supply. The overall supply of xrp is actually decreasing, for some xrp is lost per transaction.

Supply would only matter for coins that does not have a limited supply, perhaps like Ether.

Actually, there's not 100bn available - 'only' 40bn. The remainder is held by the founders

What reasons did they provide that it will hit 1000?

A few Reasons Ripple ISN't Bitcoin. Open to your counter arguments,

Ripple Network Effect - Small & Weak , No one has Ripple wallets.
Decentralisation - None. Large ownership of coins are with the founders.
Censorship Resistance- Low to None . Government or Banks (as Proxy for Government are able to censor, stop, amend supply or do anything they wish to Ripple. It cannot be an independent store of value.
Replication: How is ripple not simply replicated/ duplicated by the banks or government agency working with the banks?
More to come on this, just curious on your responses to points 1-4