For me that would cost $70,000.
(and if I actually HAD $70K I would blow it on MBL 101e speakers!)
So I have to say it is a totally impractical notion.
Plus upgrading the whole thing would always be all around minor upgrades. Instead of worthwhile major ones.
Took me eight years to upgrade my speakers.
Almost twenty to upgrade from my old DAC. (though I had tried a new $2,300 one in 2010, only to return it, as my old DAC was just as good in my system)
Now that I have a better digital sound than my analog..
I am daydreaming of buying a $12,000 phono box to even the score.
I could go for a lateral move, but WHY?
(it being what I think is my next needed upgrade. Though a better TT might.. I think the phono box would do more and THEN a new TT and cart.)
If I would have 'upgraded everything' I would have a pair of Magnepan 3.7i instead of the 20.7 I do own now.
And a new amp I never really needed, as my old amp is just great.
I would have Ygg from Schitt instead of the Marantz.