Thats not entirely true. Maribor has never had a professional team yet they have produced NT players like Mursak, Robar, Verlic (+ some interesting juniors like Unuk that are comming up) and guys like Gregorc, Kopitar, Urbas, Gracnar.. have never played professionally in Slovenia but left abroad during their teenage years.
As far as the youth development programme I think things overall havent been better in a long while, now that six teams play in the international INL league (rebirth of hockey in Celje is another positive side in this project). Sure Jesenice is a big minus, them not playing in EBEL, but I am also certain that sooner or later they will return (Kopitar family themselves said couple of times they would be ready to enter the club, though, only if all the leaches and hyenas that brought Jesenice hockey where it is today leaves and gets kicked out). Even if Slovenia will not have a team in EBEL they will be still producing young talents in the INL and those will be picked up by clubs from abroad. Either by EBEL clubs or clubs from Sweden or the Czech Republic where lots of talent are heading anyways.
About Olimpija registering in Zagreb. I believe the main reason for that is so that the Olimpija board would "re-found" their club and erease their debt (over 0,5 million only in taxes alone). Years ago things like that were possible, but now they arent anymore and it will be interesting what will they do. I doubt they will be allowed to do that and they shouldnt be. Let them pay off all the creditors first and then do what they want. This project buffles me though. I dont understand why for example would Medvescak invest in a farm team that would be playing in another country and not be investing in another Zagreb based club or founding Medvescak II that would serve them as their own farm team (either playing in EBEL or INL) where young Croatians would be given a chance. If they plan to pay off Olimpija's creditors (which I doubt) than that would have been extra crazy.