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[Too late to edit] EXTRA CREDIT: Anyone who considers tackling this and finds themselves interested in the niche of wedding/event photographer should look at combining this service with shopping-cart/gallery solutions that currently exist. The marketplace for those is fucking awful . Feel free to email me, but googling will get you the big players. I just don't wanna bash them by name in a public forum. All well mean…
I appreciate the spirit of your suggestion, but might I suggest that this would be the exact wrong move for someone trying to build the ultimate long-term cold storage for photos? Simply, they are two radically different businesses with entirely different feature sets. You might very well need both.
They're not radically different—one just uses the other. You could easily do both and continue to expand the use of the backend to enable useful applications. It's ridiculous to shun this specific consumer model just because it happens to be only one way you might use the original idea.