I don't know i think your speaking for yourself, the poster below you seems to suggest sack Wenger and let the chips fall where they may.
The right time was at the end of last season to encourage Wenger to step aside and go out on a high after the FA Cup, to be honest i think even Wenger himself would have been ammenable to that but at that time the club had no plan in place to replace him which is in itself worrying (and doesn't fill you with the highest confidence that they'd do the best job in bringing in a replacement if he were to go suddenly as opposed to the end of a campaign)