> By no means did I mean Hamburg

Ok, from your sentence, was clear to me, you like Hamburg, but you don't want grow old there.

> Additionally, the recent reforms to the pension system here pissed many young people off, and the trajectory says it will only get worse.

So to leave the system now moving to Norway, will make you get a better Pension? I think it depends of many factors, but I am not sure it is true, specially if you are 30+.

> Domestic migration within Germany doesn't really bother anyone AFAIK

That's not true as well. There is a lot of tension in the Brandenburg region, or even small cities like Leipzig.

> If you move from Hamburg to Bavaria (why would you?), that's a different story.

Hm I see a lot of reasons why moving from Hamburg to Bavaria is a good idea.. I guess it's relative.