It's not uncommon in Rec and lower divisions to roll up with one disc. Not everyone plays tourneys to win crap either. Whether you think it's stupid or not, if you get rid of minis you are making people carry at least 2 discs in the rules. That would make disc golf a tiny bit more exclusive in nature.
I have yet to see a player in a sanctioned tournament walk up with one disc, regardless of division. "It's not uncommon" is just ridiculous.