If you love the sound of the music you hear from your system then upgrades are not necessary. Getting more of what you love is what becomes most important. If you don't have vinyl and you want vinyl then whatever you buy is not an upgrade. Music servers and internet radio are a huge bonus, not an upgrade if you don't already have that capability. Any new revolutionary technology (like maybe holographics or something) is not an upgrade. As you can tell this line of reasoning allows a wide latitude and justification for the spending of money on our hobby. I can remain loyal to my present components as long as they continue to work.
