For speculation, I think one should first try to arrive at the market share that ripple can command of the total cyptocurrency market cap.

I would not expect it to command more than 10% of the total cypto market cap.

also taking into consideration 38 bllion current supply and a total supply of 100 billion, for ripple to touch .50 USD total market cap has to touch atleast 200 Billion USD.

For this year, 40 cents should be tops if the supply remains at 38 billion or there about.