I am not saying that most synths will have photos taken so close together, however I would challenge anyone on the team to reliably move precisely one photo forward or backward in this Walk synth of mine: http://photosynth.net/view/3cc1da45-53f7-4afc-b746-67cd38124a74
You may think that my example is an extreme case, however I would ask you to test this on any other new synths that you care to and come to your own conclusions after testing.
In the end, your competition is not primarily or only a mid-1990s video game system which was near and dear to one of your user's hearts or video games from the mid-1980s to current day.
Your competition will be Facebook, Flickr, OneDrive, etc. where people are accustomed to a single press left or right (or up or down in the case of some walls, panoramas, spins, and walks) reliably landing them one photo forward or back.