Sorry, but if you are "expecting other companies to follow this trend", you've missed the boat. It's been happening already, for years.
http://www.gamespot.com/articles/on-disc-dlc-an-ugly-truth-says-gears-of-war-designer/1100-6370601/
And not posting this in any way to justify it, just saying it's already happening.
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I know studios do this. I just didn't expect [u]Bungie[/u] to follow this trend. I thought they were better than that.