we had that problem with my sheltie but the other way around (they were standing up and were supposed to flop) but yeah we were told to fix it early on! (glue them down....) or else they would always stand up. We tried the glueing down thing but she was so bothered by it that we undid them and just let her be we weren't planning on showing her anyway. Lucky us they stood up for a while, then started flopping again, it went on and off for a while, now she's ten months old and they've been floppy for a couple of months steady. I would think that your dog's ears will always stay floppy.
We were also adviced to massage her ears, but that was to make them floppy?? so that got me a little confused that you would be adviced to massage them to make them stand...
hope you don't mind it too much! i'm sure your dog is just perfect and gorgeous the way he is!