[Elecraft] K2 parts to have 'on hand' ?

[Brian]

I saw a message on 'another list' the other day which was a reply to someone who was thinking about getting a K2 kit while they could. The reply said... "inferior parts.. get spare variable resistors etc."  ---- I am assuming he means potentiometers...
Anyhow, I'd not seen or heard much about this 'you gotta replace this stuff in a year' kind of view.
Since I DO have a couple K2 rigs... would I be advised to get a few critical parts to take them into the next decade or two? They probably have more than a decade on them already.
I must admit that in the VERY early days I asked Eric how long we might expect the microprocessors to last? Meh, never been an issue nor has anything else in them, for me at least, luckily perhaps. Or the norm....

I realise nothing 'lasts forever' but since almost every thing I have is getting on... and some are pushing MY age from late 50's and early 60's circa some things can last a long time.
In any case, any wisdom on what to get on the shelf and have at hand while it is possible?... or don't worry and if the time comes just say a fond farewell? Or will I not care if and when a K4 finally landed here sometime (not thinking about that....yet).

Having Winter fun on CW here...hope you are too.
Brian VE3VAW