The smallest semi-auto I currently own is a Glock 26. I will occasionally carry the Glock in place of a snub, but I can't see it ever replacing it. My primary reason for opting to go with an auto is significant additional capacity. I feel like I get that with the G26. I haven't shown much interest in guns like the Shield or Glock 43 because they have as large a footprint and are actually heavier than my snubs without offering a substantial enough round count increase to compensate for trading away the revolvers advantages.

I do have somewhat of a passing interest in very small, light autos that have an equivalent capacity as my J's, but are significantly smaller as well as lighter. I'm not overly enthusiastic about .380, but could see it filling a niche in certain instances since such small guns can go places and be carried in methods where even an airweight snub might be considered too large. The only problem is I haven't come across a model that has the reliability reputation that I'd like to see.
Neck Chain Holster: Stellar Rigs' Travel-Friendly Carry Design