I personally think a swift change PoS rate from 70-100% to 2-5% is not a good idea, it's a very big change for a coin and its specification. I very much prefer a more slow gradual decrease on shorter intervals (e.g. instead of jumping from 100% in year 1 to 2% in year 2, we can do a slow decrease every 1-2 months until we get to 2% within 2-3 years).

I don't think the original developer thought about the long-term PoS issues of the coin, this is evident from the code he wrote but this is something that we need to decide.