Think about how much technology has changed in the last twenty years. Twenty years ago the CD was just then replacing the cassette player. Now CD's are almost obsolete with the advent of MP3 and jump drives. The point is now is the time to take a shot at future-proofing the house.
AC wireless and 10gig Ethernet should hold up pretty well. Ten years from now those will be like N wireless and Cat 6a cable today - better options will be available, but those two will still be usable.
If you plan to stay twenty years or more, it really, really won't hurt to run everything in conduit to make the inevitable upgrades as painless as possible.
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I'm not completely useless, I can be used as a bad example.
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