It´s been proven time and time again that SW movie scene sets are not as popular as spacecraft (I count DS as a spacecraft rather than a scene). It´s a more niche product for completists and we could say that this set was much better than AoH or Ewok Village, to name two others. They know they sell few so the price compensates and if it really tanks they just cut production.
TLG is still turning double-digit profit figures so there is room for plenty more mistakes before they do a GM, Nokia or Blackberry.
We should give them credit for integrating tech and apps in Hidden Side and new Power Functions but that is also a double edged sword as then you are relying on outside technology via Android and the compatible phones and at some point those items will be obsolete. They will also have to keep working on their own app so expenditure will rise.
Are they in a worse position than Hasbro, Playmobil or Mattel? Probably not and they can still get away with plenty lazy remakes to cater for the next generations of kids.
The whole plastic environmental issue is one thing that is out of their hands and that could eventually bring them down - even if the toxic waste from batteries from all these damn hybrid cars and one year-life-cycle fadphones is worse, yet no one is talking about it.