Platform agnostic tools have hardly done anything on the desktop or mobile. If you're writing a mac app without Cocoa or a Windows app without .NET (or other various Microsoft technologies) you're going to have a bad time.
Python and Ruby might be first class languages on the web, but they're never going to be on the desktop/mobile. (Yes I know about things like RubyMotion)
No devs under 30 work on Microsoft stuff? Even if you take that to mean "No dev under 30 wants to work on Microsoft stuff", that is ridiculous.
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Platform agnostic tools have hardly done anything on the desktop or mobile. If you're writing a mac app without Cocoa or a Windows app without .NET (or other various Microsoft technologies) you're going to have a bad time.
Python and Ruby might be first class languages on the web, but they're never going to be on the desktop/mobile. (Yes I know about things like RubyMotion)
No devs under 30 work on Microsoft stuff? Even if you take that to mean "No dev under 30 wants to work on Microsoft stuff", that is ridiculous.