[codeshaman]

I bet this art is not dying, but actually flourishing like never before.

The sheer amount of information in the form of websites, books, videos and so on should be a pointer. I mean just google "mental math tricks"..

It's true that we can offload complicated brain tasks like number crunching to computers, but people do a lot of hard things also because the process gives them satisfaction. They climb mountains and walk thousands of miles not because they want to get somewhere, but because it's exciting and hard.

For this reason, I think people will continue to study and invent new mental math tricks...

More people, more free time, almost infinite info available... No, this art isn't going anywhere ;)