Of course, if governments around the world contiune to struggle to deal with their debts, they will probably eventually - or continue to - devalue (quantitative easing) their currencies.
In this instance, as in the late 1970's, inflation could really pick up, so any investment with inflation linking would be highly prized.
Cash ISA's, paying 3.5% with inflation soaring to 10% would result in life savings which once might have bought a nice new car, being only able to buy a moped after ten years.
If inflation stays at the recent 5% per year, then even a 16.5p inflation-linked FiT will be offering close to 10% annual return on a 3.6kWp/£9000 outlay.
Do not underestimate the safety net which inflation-linking provides.