"But i was thinking, the governement will always try to stabalize it around what they think is optimal, usually around 2%, thus meaning that longer than 1 year a forecast wouldn't make sense."
Quite the opposite. As the big MF himself said: 'Inflation is always and everywhere a monetary phenomenon'. The kind of monetary tools we have at our disposal are generally considered to take something in the region of 12-18months to have an effect on inflation - hence inflation forcasts further than one year out are quite important.
As morty says, the best predicor is the relative yield spread between a nominal and a real bond of the same credit quality. The current trend for liability matching may distort this a little - certainly in the UK where pension funds are scrambling to fill their boots with long-term index-linked bonds.