Very much so. They are introducing federation features, that make these even more of a reality.

I just tried this out on Sandstorm. I have to be honest in that I didn't like the interface. I can only upload one file at a time. I'm looking for an app that can replace G+ photos / posts (but private rather than public). I need to be able to upload thousands of photos and videos.

I also tried out Lychee on Sandstorm as well. Whilst that can upload multiple files at once, you can't organise multiple files at the same time.

OpenPhoto looked like a good option, but I had some real struggles trying to get it to work on a Ubuntu server on Digital Ocean. Not sure what I was doing wrong, but I got some really weird errors that I couldn't get to the bottom of.

The best photo / blog app I've come across is embedded in my Synology NAS system. It's awesome, but without a fibre connection you just can't host photos and videos on a residential internet connection (although that would be the perfect solution).