16 years of the same system, time for change?

213runnin... there is merit to your comment. Prior to your comment I went and found some Squalin oil I bought a billion years ago (ok figure of speech) and wiped all connection down.
To say an improvement was not garnered would be a lie.At this point I now believe the cost to make a significant sonic improvement would be beyond my means. 

Good news indeed.  Decent quality gear will still sound good after 25 years or more, as long as it’s not abused.  You don’t sound like the abusive type.

There is one area that has experienced a revolution though, since 2004 or so.  Loudspeakers.  Better performance/SQ achieved at  lower prices.  Perhaps it’s the China Effect, as they’ve gotten much better at copying technology.

I bought some made in China KefQ750 recently and they so seriously trounce my old Paradigm Monitor 11v4, it is not funny.  The street price of the kef’s was about 1100.  That said, good quality speakers from 2005 will still sound excellent, it’s just that generally speaking, that level of SQ is cheaper to achieve these days.

Don‘t ... tomorrow is another day

Dump everything and move on.