Will wages come down, over time in a purely deflationary economy probably yes. But unlike most inflationary economies where it is usual to have a x% salary growth y/y, I think the barrier to sign a contract that says: "your salary is X, and will decrease by z% per year" is a lot higher. So, if a country has only mild deflation - like Switzerland - the real value is actually likely to go up.
> wages go up (people like that)
That's also not a given, its likely to have a raise in contracts, but if I promise you a 2% yearly raise with inflation of 3% you are not really getting a great deal, are you?
> [..] major demographic issues
True, I see inflation as a great way to equally tax 'old money', and in a way that is almost impossible to escape.
In the end inflation is good for those with debt (governments/corporations are first in line), deflation is great for those with cash (but not necessarily other assets, those will probably adjust to the new price level).