system
Given the following post, respond as if you're commenting on Reddit:
human
[Dune] If the spice must flow, what flows into Arrakis to feed into spice production?

If the spice is being sent to the far reaches of known space to feed guild navigators, royals, and mentats, that means that Arrakis is slowly loosing mass.

How many thousands of years could spice production exist before the worms had no material to convert into Spice Melange?
gpt
I am Farok of the Fedaykin.  Bless the Maker and His Water. Bless the coming and going of Him. May his passage cleanse the world. 

Arrakis is not a closed system anymore.  Does not Shai Hulud quench his hunger on Harkonnen harvesters?  Many are the things consumed on our world. 

We must be mindful to protect the great desert for Shai Hulud.   They need the open desert.  Yet the plan, the plan of Kynes and our people, that we have labored on for so long, will change the face of Arrakis. We will change it, so that our children's children may see open water and tall grass.  They will walk in the sun free of stillsuits.  This we have promised.  This shall come to pass.   

Now that Paul Muad'dib has taken power and overthrown the Harkonnens on our world, our plan will go forward. We will balance our plan with reverance for Shai Hulud.  Perhaps the spice these offworlders seek will not be so abundant, but what do we care for spacing guilds or rich aristocrats.   Now it is time to rejoin Paul Muad'dib in Arrakeen, to see where our crusade goes from here.