I could see this as working pretty well.
They could do the following:
9 total minifigures - perhaps 4 main characters, 3 support/army builder characters and 2 Holiday themed characters (Santa Wolverine, Christmas Ornament MODOK, Moloid Elf.......)
10 Micro Vehicles
OR
5 Mini Vehicles between 10 days - 2 consecutive days for 1 vehicle.
and to finish it up, 5 Accessory stands - could be character weapons, general scene items like dumpsters, computer terminals, or even a decorative display like a brick wall for Spiderman to hang from or the Hulk to crash through.
I'd totally buy something similar to this, it's the basic set up for the Star Wars Calendars.