To your point about toddlers - safe storage and safe methods of carry solves that, and they work with every gun in circulation already.
1) Lock up your gun if it's not directly under your control (i.e., in a holster).
2) Carry your gun in a proper holster, on your person. Not in your purse in the shopping cart, but on your hip.
These two, together, would prevent every case where a toddler shoots somebody.
It's not appreciated outside gun circles, and sadly even in gun circles a lot of people don't get it, but good holsters are the most important investment you can make. A huge fraction of gun accidents trace back to cheap holsters.