I think it's all down to several things. The surviving cast members who are interested or able to attend are really getting on in years. I was thinking about this and realizing that if what I have read is correct, Lara will be 80 next year. Sobering but then I myself will be 59. and I was 10 when I started watching back in 1968.
Thanks to WorldVision, the series isn't on the air apart from the same small packet of shows periodically run on Decades. The cult shows that get the marketing are either prominently available such as TZ and Outer Limits, or have more active rebootings such as Trek and the Apes sagas.
As Michael commented, the marketing angle for DS was always sub-par, at least as far as I am concerned. The best products in terms of design and flair were the gum cards. What does that tell you?
Hadn't heard about the lunchbox--that could be fun. Some "Blu Ray" products might have stimulated at least some interest, but home video in physical format is widely regarded as going the way of the dinosaur. I myself am going to hang onto my discs until they are pried from my dead fingers because I don't really trust the "streaming" sites to have the content I want in the way I want it. but then, I'm antediluvian, at this point.
G.