Just completed a project with around 10,000 images.
Images were across ~150 collection items, with incremental multi-image fields i.e. 1-25, 25-50 etc.
Custom code was then required to combine these multi-image fields to display as one coherent gallery on the collection page.
It would be great to be able to increase the multi-image limit from 25 or even to remove it entirely.
Could see the potential for extending this to lead to google drive/dropbox import scenarios.