Hi Manuel. In principle I like the idea. Some questions:
"The widgets would be self-optimizing and always show current products from your store" - how would that work? I'd need to maintain my product database at Product Widgets to make sure its in sync with my shopify stores products, right? Or would it automatically feed my product list into Product Widgets? Avoiding duplication and needing to keep both places up to date with what's in stock would be a big help.
I thought of another scenario. Most products I sell directly, but for products that I don't want to mass produce, I've been thinking about adding my designs to some of the print on demand sizes like http://society6.com/ could I then use Product Widgets to display widgets of my print on demand products alongside my real shopify products inside my shopify store?
There was an app that did something similar but its been orphaned for several months - https://apps.shopify.com/shopify-widgets
Thanks,
Adam