I doubt we will see the chain disappear for good. That is, unless someone can find another method that is as cheap to run, but costs less to maintain. If you look at the newest technologies being picked up by companies they usually have something to do with reducing maintenance costs. This includes things like magnetic brakes and anti-rollbacks that make no contact unless needed. Intamin may have pioneered some of these ideas, but other companies are picking them up more and more.
Reducing costs is a goal of companies in just about every industry. People go to school to get Industrial Engineering degrees just to specialize in solving this problem.
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James Draeger
http://draegs.tripod.com/ "Legend is a wooden Jesus"