The death of calculator market?

[Artur - Brasil]

Two weeks ago I could finally get the HP Prime G2! Wow, so beautifull.
So, I took it to my brother, who is a teacher in a reference University here in Brazil and he told me: "why someone would need a calculator nowadays? Computers have everything, cell phones, tablets". That was like a puch in my face!
Now, this thread here and it made me to remember another one, in the general forum, where many of us showed vast shelves with hundred of preciosities: boxes and boxes of shinning HP-15C, 41C, CV, CX, hundreds of accessories...
I'm a 54 year-old man. So, my so well cared-off collection: two HP-15C, one 41 and one 50G will serve for what? Make money? Show them to my sons: "see the power of HP calculators"?
Ha, ha! They will laugh at my face!
As we kept them in shelves, we may contributed for their completely no value in future... the inverse of what we want - to preserve their importance and may be do some money with our treasures...
My opnion, of course. Not to blame anyone.