2. Is there a good calculator for ROI and estimated rewards ( per day ) that calculates 5-10 years in the future or allows an input for estimated future value of BTC ?
No one can know what the future holds: the BTC mining difficulty, the various regulation changes in different countries, the capacity to produce ASICs of varying levels of performance, are absolutely unpredictable on a 5 or 10 years timescale.
Wouldn't it be too easy if we were able to predict the price of BTC and its difficulty?
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3. Will BlackRock and the central bankers be able to fork BTC into a proof of stake coin? ( How are changes to BTC created ?)
And even if they created a proof-of-stake fork of BTC, I don't know who would be crazy enough to turn away from BTC for a PoS-based fork.
As stompix said, it's been done before, and the result speaks for itself.