That's a really great idea for kids drawings. I'll always keep a select few special ones, but any parent knows you'll end up with an art gallery if you keep everything. Making a digital art gallery of that stuff is a really good approach to letting go.
I wouldn't go that far. No digital gallery will keep the physicality of your kids' art and you'll really cherish that part when they're older, and throwing away what your kid makes is really going to squash any interest in making more of it.
