I've got 2 daylily seedlings from 2014 that still haven't bloomed for me also. Last year they looked kinda puny compared to the ones that bloomed. This year they are looking huge so I'm hoping they bloom.
I have no idea what they will look like though. I had planted 3 different crosses in January and twice that winter a starling flew into the house and knocked over all the cups I was sowing the seeds in! If it's not cats, it's birds!
I also have seedlings grown last year but I doubt they will bloom this year. But maybe one will surprise me!