As an aside what is the real world version of "technical debt?" Tesla's tent factories has helped them accelerate manufacturing, but is that a technical debt they'll have to come back and fix later? I've also read people speculate it could increase warranty return/recall rates due to contaminants (e.g. dirt, dust, etc) in the tents, which if true, could be another source of future debt.
They now have the second line in the temporary structure which let them test some different methods and can provide some pressure relief while they rework the main GA line.
They have been planning to expand and build new buildings at the Freemont plant for quite a while now [1], so I would expect the 'Tent' line to move to a more permanent location eventually.
[1] https://www.reddit.com/r/teslamotors/comments/8s9913/teslas_...
Edit: As someone in the reddit comments pointed out, the new Tent/GA4 line is on the location of an already planned new building (#11 in the drawing), so perhaps the line stays in place and a more permanent building is built around it.
“GA4, our new General Assembly line for Model 3, was responsible for roughly 20% of Model 3s produced last week, with quality from that line being as good as our regular GA3 line. We expect that GA3 alone can reach a production rate of 5,000 Model 3s per week soon, but GA4 helped to get us there faster and will also help to exceed that rate.”