Except for a few (e,g. Tron LE), I suspect we will see most LEs stabilize into the range of (Premium + $1k or less).
Most hobbies to who just want to play aren't going to pay the LE premium - that is going to be those that love the theme almost more than anything else and/or just have to have the extra bling. I think we are seeing that the LE cost premium has become the "I gotta have it tax".
This isn't going to hurt those new to the hobby - the average person isn't going to be spending $7,8,9k on an LE (or probably anything else), but it is going to slow down those that like to buy every game, play/sell them and get something new because they won't want to be in the position of losing a couple grand to do so.
When I bought STLE, I knew I was going to "lose" money right away - I bought at the September preorder peak, bought from a local dealer (sales tax), and wanted extra bling (great work by Pinball Refinery). I don't even know exactly how much $ I have in the game and not a lot of interest in doing the math. Why? Because I can't imagine even thinking of selling the game any time soon. Don't know if I will have it 20 years, but I'll certainly have it more than 20 months or 20 weeks.
I wanted the game (loved the back glass and hated the coloring of the Premium), like the ST theme even though I'm not a big fan of the reboot, wanted a Trek pin again and wanted a fast Ritchie pin.
Very few themes are going to make me consider an LE, so paying an occasional "gotta have it" tax isn't going to bother me.