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I doubt it, but you never know. Most likely, the services will just be changed to use web standard. I just cannot see Google killing services that are used by nearly 10% of Chrome users such as Talk and Google Earth. Google Earth in particular is a bit of flagship offering from the company, so it’s safe. They might change somewhat, but I seriously doubt they are going away.
Keep in mind that Firefox also plans to eliminate most browser plugins by next year. This is not really a content issue, it is more of a security issue.