If you aren't a "super dev" or invest a large amount of money in a idea or a site of yours that could possibly bring back big time returns... There is no way to earn 25+BTC a month... Hell, probably not even 10+BTC a month. You would have to find a very good nitch service which you could provide for a high price... other than that, no possible way in hell.
well senior profession jobs can pay that high if you are in developed country. however, if you are in country with weak currency, then that is an BIG sum for you.
Well I'm just considering the fact that people with real jobs outside of online jobs, whether you are in a developed country or not, you will have to keep some/a majority of your income in fiat so you can pay bills... until there are companies like water, electric, insurances, and that sort of thing that will accept bitcoins; people will remain attached to the fiat system in some kind of way... Companies like those will be the last ones to adopt bitcoins, because they are so closely tied with the government.