They might go up - have you shaved them? have you taped them?
If you look at Rexy in the pix, his ears are down and he is now 9 months old, so they aren't going to stand. But we gave them every opportunity to stand by keeping them shaved, entirely from top to bottom, until he was 6 months old. We even taped them up, but they are just too "thick" to stand. They are pretty big too.
We think he is absolutely adorable with "down" ears - but just like you, I wanted them to stand, if they would. However, now that his ears are down - we think he is just too cute! In fact, he gets more oohs and ahhs than Rowdy (with "up" ears)! Go figure!!!