I think that's fine, especially if the Wizard doesn't have any training in a skill that might help finding food. Actually, I'd expect a wizard (at least in D&D) to know a spell that might help, though.With these rules, the wizard will never succeed in finding food after the ranger and the rogue fail. So it's just a matter of whether anyone considers this to be a worse gameplay issue than letting everyone have an attempt, and virtually guaranteeing success on any check that only needs one success (unless the GM artificially inflates the difficulties).
The question to me is:
How many checks are there that only need one success? Finding food seems to be an activity that allows for multiple successes to lead to better results, i.e. find _more_ food.
The thread that inspired this discussion was mainly about Knowledge skills. Knowledge skills, imho, also work best, if multiple successes can be used to improve the initial result, i.e. hand out information in small increments. This also simulates that if one pc remembers something and tells the others, it may remind them of something they initially didn't think of on their own.