I fail to see how these long dresses wouldn't catch on. I'm a fan of ladies bearing their legs in short sundresses as well as miniskirts. However, long dresses can be just as fun an as airy. I'm not particularly fond of gladiator sandals, but I do think anything from some flip-flops all the way to espadrilles and peep-toe pumps (remember I'm not fond of flat and low-heel peep-toe shoes). You could try sneakers with certain long dresses, but I likely wouldn't do so if I were a femme. My former Humanities teacher didn't wear a long dress, but a long jumper. She paired them with these lovely espadrilles.
By all means, try finding some shoes or sandals that would best suit dresses like the ones in this thread. After all, part of the fun of fashion is experimentation, right? It's like building a sports team. Putting the best team together and making all the units gel together is key to a team winning championships. Just ask the 2006 San Antonio Spurs, the 2006 Indianapolis Colts, or my 2006 Houston Dynamo (MLS). Anyways, you have many choices on how to dress up wearing your long dress.