Without saying "Never":

1) Currently, I don't keep track of how much you've used your familiar, and I'm not interested in doing something like this without the roll-the-bones-like restriction of 'You need to swap this as soon as you see what you've got, without getting to use it a while first.'

2) Probably at level 17 you can't pick / can't afford the edge for it, so I assume 99% of the people who didn't like their familiar would still just reroll.