No, they should be raised according to Inflation. Which means you can allow wages to freeze in a period of deflation.
So in other words, you want the default position to be a net wage increase in real terms over time? That simply is not sustainable over time. Wages should and can adjust over time as the economy and the need for certain jobs changes.
That sounds nice on paper, but in reality the opposite seems to be the case, as everyone I know who has a job is making more now then they would have in the 1880's, the 1920's or the 1950's.
On a more serious note, the default position should be 'purchasing power' (do you guys have that term?) not going down, or not going down significantly over a longer period of time. And if possible at all, it should be rising.