Come on Dude! I was talking about product life cycles, not Digital to Analog Conversion in general. If you're going to be a smart ass at least understand the statement you're being snarky about.
If you spent $1800 on a Wavelength Brick 4 years ago.... It was state of the art. Today a Wavelength Brick with Asynchronous USB is old news.
Likewise if you spent $2500 or $5000 on a Theta Digital or Meitner front end a few years ago.... you could get the same specs plus asynchronous USB these days for 1/10th of what you paid back then.
My point being that digital audio is growing at a much faster clip than analog, similar to computer technology. So people that blow $10 or $17 grand on an MSB DAC "may" find that in 5 years their legacy DAC doesn't look like such a smart purchase. It looks like an outdated piece of kit.
However a $5000 well designed Amplifier will be an outstanding amplifier for years and years. You buy a Luxman SQ-38 or a Leben CS300 and you've got something that will last you decades and can ultimately be handed down to your kid. I have a Pioneer SX 1050 that is worth more today than it was when it was new on the shelves.
So purchasing an Arcam rDac that is looking a little dated is still a smart move since the $1000 Rega is looking long in the tooth itself.