Is it possible to change some of those deprecation from Warn-by-default (but 
can add a warning filter to make them error) to error-by-default (but can add a 
filter to make them only warnings). 

That way it is easy to fix large projects (even w/o modifying the source) in 
only a couple of lines of codes; and they buy themselves a year or so and 
remove in 3.10. 

That way you have a more gradual transition; and a clear signal to project with 
a last chance to fix issues.
And that way can't complained they did not know as they have to opt-in.
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