I hope Valve changes it to where maybe you can give kritz, ubersaw, escape plan, and ubersaw for free and replace the milestones with things like Crusader's Crossbow(or free?), Vitasaw, Black Box, and etc.
Offtopic but I can see there being a competitive starter pack with relevant unlocks being available free/cheap on the store/a reward for playing x matchmaking games or whatever. Although I wouldn't count on valve just accepting the current meta unlocks as the essentials but rather encourage players to use various/broken unlocks as they said they're trying to use matchmaking to gather balancing data.