[jansan]

It is guaraneed to be less value in 20-30 years, because Germany's pensions are transferred directly from the pension fee deducted from salary of employees. And since in 20-30 years you will have a totally diffeerent ratio of number of employees vs. pensioners, the cake will be smaller and will have to be distributed to more people. No matter how inflation or anything works out in future, pensioners will then have less than pensioners now, who more or less live in paradise.

[Tainnor]

It's wise to be prepared for this scenario for the reasons you mention, but in 20-30 years a lot can obviously change; either a change to the way the pensions are funded (this already started happening to a small extent) or a sudden influx of qualified (!) migrants.

I wouldn't bet on any of it happening, but predicting the future is always hard.