Why make future vision videos

No doubt, many of us have seen the very futuristic videos from various technology manufacturers, like Microsoft, android, Nokia, HTC, and even Firefox. These videos can be of various different technologies. As the name “future vision” may suggest, the videos are usually of a vision of the future, but they might be of a certain product as well. All of these portray, to some extent, various technology which is not yet available, or even possible. Yet the question stands. Why are these videos made if the products portrayed in them are far from ever being released?
The answer is simple. To dream. The future vision videos are somewhat like a statement of intent given to fans and brand loyalists. So, if the products advertised aren’t actually coming out for a veeeery long while, people can still get a good idea about where the company is headed and where its goals lie. For example, the future vision video made by Microsoft introduces their dream of integrating touch sensitive surfaces and 3d imaging\hologram to almost all facets of life, thus making technology more integrated with everyday activities like planning meetings, doing office work, or even cooking. Most times, these videos try and demonstrate how  tech can be integrated with daily activities and normal work process. This is perhaps an explanation to why these videos are published so freely. There are no new patentable tech ideas which could be compromised by publishing the video. And if there are any, they are probably already patented.
This way, manufacturers can just make videos of their ideas and goals concerning the technology they want to make. This really has no negative impact, if it lets the design team keep working and the fans keep ogling and cool looking new tech.