Here are the supercharger openings by quarter since the first full quarter that Tesla started the Supercharger build out.
Now, keep in mind, while these numbers will prove that Q1 '17 is indeed very low, what is more important in the context of this is that Musk said there would be TWICE as many built from April 1st 2016 to Dec 31st 2017. So, that means the 7 quarters starting the day Musk made that statement (Q2 '16 through Q4 '17) would need to equal the number of superchargers built in the previous 10 quarters (Q4 '13 through Q1 16). So I'm not just comparing the numbers for each quarter as an apple to apple comparison, I am also figuring in the increase that we should be seeing in the openings in order to double the number of superchargers - which was the basis of this thread to begin with.
Anyway, let's take a look at the numbers:
Q4 2013 36
Q1 2014 30
Q2 2014 28
Q3 2014 76
Q4 2014 126
Q1 2015 72
Q2 2015 43
Q3 2015 69
Q4 2015 72
Q1 2016 28
Q2 2016 48
Q3 2016 57
Q4 2016 85
Q1 2017 40
Let's analyze those numbers.
Q4 '16 was the 2nd highest number of openings ever - second only to Q4 '16 - a clear indication of the ramp up in openings that Musk talked about.
In the 3 quarters since Musk made that statement, the openings were 48, 57, and 85 (increasing 20% and 30% respectively). In Q1 '17, the openings dropped to 40 - less than half the previous quarter.
The average number of openings per quarter before Q1 2017 was 59. In a time where the superchargers were suppose to be increasing rapidly, Tesla opened 19 less than it's average.
The average number of openings in the 10 quarters prior to Musk's statement was 58. The average in the 3 months after Musk's statement was 63 (and increasing). Q1 '17 openings were 23 less than the average since Musk made his statement that the number of supercharger locations would double.
40 openings is the second lowest number of openings in any quarter since Q2 '14.
To reach 1200 openings by Dec 31st of this year, Tesla will have to open 121 supercharger stations each of the last 3 quarters. That is certainly possible since they opened 126 in Q4 2014. But, with only 11 known to be in construction, and 11 in the permit stage, building anything close to 121 this quarter will be almost impossible. I will fully admit that getting to, or close to the 1200 is still VERY possible, but it will take a ramp up of significant proportion over the next 8 months. If however, this continued rate of 40 to 85 per quarter continues, then it is obvious, as I stated in my OP, Tesla/Musk changed their strategy in regards to doubling the number of superchargers by EOY 2017 - which is a clear indication to why the sudden slow down of openings AFTER the 85 that opened in Q4 '16.