It is true that it's all very competitive. It's true that online casting sites has reduced some of the compensation that independents will pay for voiceover work. It is true that you will probably not be discovered and made rich all of a sudden.
It is also true that there is more work than ever before. It is true that fewer live instructors are being paid to coach corporate people because they are having voiceover people narrate power point and video tutorials, It is true that the voiceover industry is changing very rapidly and you shouldn't let it scare you at all. Pay attention. Take notes. Form a plan, reinvent and go get some work.
It's true, you can do it:)