All a "guild qualification requirement" will do is hurt smaller guilds

It would have been better if the expectation was managed better. If they came out, at the start, to say they are having a new TB and it is expected that there will be a gp minimum requirement of around such a figure, due to difficulty, then that would have managed disappointment better. My guild is someway off and I agree with the OP in so far as it will cause problems of trying to reach that goal. We still climb in gp but takes longer due to others moving to other guilds, even though they would have liked to stay put.