I am just about to start Fairy Tail and wanted to ask here how many of the episodes are officially dubbed by now? I understand the series is not complete yet...and I think I read that not all of the eps out are dubbed but wanted to ask here. The style and art of the series looks fantastic from a peek at the first ep, and it is just the sort of epic series that I really enjoy, with a nice mixture of fantasy, mysticism and a great world for it all to take place in. Glad to see a good strong thread for it here. 
Not even if anyone has started dubbing them at all. Their are 69 ep out already. Personally I recommend watching them in their original audio, with subs of course. The personalities of the characters are somewhat lost in the dubbing process.
the dragons have been forced or something to their own realm, so the only way to find Igneel, would be to travel between realms, unless they start breaking the law that prevents them from coming back
Only reason this couldn't be even remotely true is, your forgetting that Gajeel and Wendy corresponding dragons is also missing; no matter how strong anything can be you really think a horde of dragons couldn't handle it if it was really a threat.
If anything, here's something to think about; all the dragons around the world disappeared on the same day and year Lucy's mother died........ Have some fun with that thought ^_^