It's not necessarily about a "weak currency", salaries for a same job are different within a same country solely due to differences in contexts, and bitcoin wouldn't make that reality any different and it doesn't haves to because at that point the difference in wages is, indeed, just compensating different contexts. You can not judge your wage by comparing it to the wage of a person who lives a completely different context than yours, but only by the living standard it allows you to get within your specific context.