It is positive that Tesla continues to achieve greater efficiencies in S/X production and that they have the potential to produce more units in the future.
What I see as neutral or perhaps negative is that production is acknowledged by Tesla to be limited by demand. In the US, I think it's clear that a significant amount of demand for all Tesla vehicles (S/3/X) was pulled forward to Q4 2018 due to the step-down of the federal tax credit.
Looking at some of the Model 3 delivery threads on this forum, I'm seeing very little US activity in 2019 so far. I think this will change, as Tesla vehicles remain quite desirable and demand will grow organically. There may be another rush of buyers in Q2, before the US tax credit gets cut in half again. But Q1 demand may prove to be quite low in the US. In addition, in the broader US auto market, Q1 is generally the slowest quarter.
Particularly in Europe and China, where most Q1 demand likely lies, the size of the Model 3 should be more appropriate for most buyers. There should consequently be little need to sell 75 kWh versions of the S/X outside North America, where the S/X are best positioned as vehicles for the wealthy. In China, in particular, the Model X is a very visible status symbol and I expect that high-end buyers will be happy to pay up for the 100 kWh version. For less wealthy buyers who want an SUV/CUV, the Model Y is set to be unveiled soon.
Also, I am still hoping that Tesla will soon introduce variants of the S and X with more battery capacity/range, followed eventually by a price decrease on the 100 kWh models. This would really cement Tesla's lead relative to new competitors like the i-Pace, e-Tron, and Taycan. But they can probably wait until at least Q2 to do this.
For those of us in North America who value the larger size of the S/X but aren't prepared to pay $100K for a vehicle, there's always the Tesla pre-owned market...