I'd say the habitat is good for any independent developer who knows how to deliver a quality solution that meets the client's needs. In my experience, most clients don't particularly care what specific tools are used to deliver that solution as long as it works. The exception is when working with corporate clients who have to conform to standards set for their IT shops, but even then I have not found the choice of VFP to be an issue. An eyebrow raiser, maybe, but not a roadblock.
With Ken Levey 'educating' the IT shops it won't even be an eyebrow raiser in the future.