Is there such a thing as a FOREVER DAC/streamer?

Sends on your disposable income , in 5 years there maybe something 

much better for less money , that being said  if it’s built well and sounds verygood 

no reason to keep buying. In Highend audio sometimes you may have to 

spend 2x as much to gain 5%+ . Diminishing returns ,you can always get a little better if you have-the $$ to burn 🔥 !! 

Check out MSB Technologies. 

Let us know what you decide to do and good luck in this journey!

In my opinion, getting a quality setup now on the digital side is a worthwhile investment even if it might be surpassed in five years or whatever quoted timeline. Because one thing that is irrelevant is of time is having a setup you can enjoy. A component with good isolation, clean power supply, usability, etc will still be providing that same quality five years from now.

If a setup today makes you content for years to come, that’s what counts in my view in terms of making an investment.

No such thing really. 
however, some have firmware updates. 
Take the Lumin (I have a D2)… since I purchased, there have been several updates. 
it’s part of their DNA to continue the updates. For my non-vinyl purposes, this is possible my last streamer purchase. 
 

the PS Audio airLens looks quite interesting, however. 

+1@jeffreyw

Check out Aries Cerat