Get real, first the economy crashes and all of the laid off pilots are back filling jobs that are normally taken by low time pilots, then, we have the pay for training which is said hurt the whole market, now you want to take the only thing that people have to build hours left, flight instructing and tell people that they can't do that if they are only there to build hours??!! I say to that, get real.
Flight instructing is the traditional way for people to build hours, and I will honestly say, when I become an instructor, I will be there to build hours and collect what little paycheck I can. I will though be the best instructor as I possibly can.
It is up to each student to determine if the instructor is not committed to the best instruction that they can give, and if it's felt that he/she is not, to find another instructor.
Until I can buy a house, provide for a family and save money to retire on, flight instruction will be an hour builder and only that. (Unless it's what you enjoy doing, then more power to you)
So, if you think that this person with the original post should build time elsewhere, then make some constructive suggestions instead of just talking outta your butt.
Brian