It might be on to Plan B, with an attempt to get walk-ins later in the summer before my son heads off to college. Bummer.
Not a bummer. You can likely score walk-in permits (especially midweek - All through August and September by clicking the above link you'll see Tuesday, Wednesday, and Thursdays have many unused permits in past years.) You'll have less (almost no) worries about snow (I did forego summitting late August a few years ago because of snow above Iceberg Lake).