The business model is such that it can't end. Hardware, software, and content providers have to keep providing new things for consumers to buy. Of couse, they need to market those items, to convince people that they "need" something perceived as better.
In the "old days," when a technology generation was a decade or more people purchased things like stereos, phones, and televisions. They lasted for years. Many were actually worth having fixed when they broke.
New tech has made that model a thing of the distant past.
If you're a hardware vendor and you make displays, you want to be able to take your technology, make modest changes to it, but market it as the next "must have."
Similarly, if you have a library of movies, re-releasing them with higher def, enhanced audio, or 3D is a way to capitalize on your investment. When a Hollywood studio budgets for a movie, they look at all the markets: First run in theaters, DVD, BR, cable, network, airlines, etc. Eventually, the market starts to dry up for that investment. The next thing is to re-release it in 3D in all those same markets. When you add all the mobile devices into the mix and how much additional revenue is possible from all of these sources, you can understand why spending many millions of dollars to initially market a film is just part of the investment.
Then you throw in the sequels to a built-in market and that initial $100 or $200 million doesn't seem as insane as it might have.
So, the answer to your question "will this ever end?" is "no."
