Save, Sell Metal ? Carbon Fiber, Fiber Optic, Satillite

so whats the opinions ?
as technology becomes more advanced something go out of fashion or not used as often

I have been reading online that the future of silver,gold and other precious metals is uncertian as with semi precious metals. Computers and electrics are mass produced so cheap they dont use gold or silver plating inside like in the late 70's 80's. Many telecommunications lines that used copper and silver contacts are being replaced with satillite ,wireless connections and fiber optics over the last 10-20yrs.Many cheap alloys are decent conductors and used today.Even steel parts are being replaced by plastic ones ( look at cars bumpers and so on)
carbon fiber is lighter then metal and used alot now.


so will the technology in the future drive prices lower?
or maybe less of the metals will be mined as demand gets lower using the produce less to keep demand high?

so it goes to the choice or profit/investment or to collect
if someone has a silver quater common date and can get 3$ for it
if silver falls to 9$ a oz then they will only get 1.50$ for it
or if they hold silver gets up to around 40$ they can get close to $7
for it.
i read some of the old times back around 1980 sold massive amounts or silver coinage and were glad they did in few years things crashed

so save ?
sell ?
or collect for the love or it?

whats the opinions?