Other than a small collection of repetitiously vocal loudmouths, no one is clamoring for this.
And such a machine would be an even worse server than their current (meager) server offerings.
Explain how such a product could possibly be worse than the non-upgradable Mac Mini.
Explain how such a product wouldn't sell more than an Xserve.
Explain how such a product wouldn't have both consumer and server appeal.
You basically shot down the idea in loudmouth fashion yourself.
It never ceases to amaze me how everyone on this site accepts Jobs every excuse like Mana from Heaven!