Let's see how VGC lines up with PS4's sales history.
2.1M as of December 1st, 2013 | 2,133,547 (Basically spot on)
4.2M as of December 28th, 2013 | 4,193,840 (Could increase it to hit 4.2M)
5.3M as of February 8th, 2014 | 5,419,498 (Over 119K)
6.0M as of March 2nd, 2014 | 6,251,669 (Over 250K)
7.0M as of April 6th, 2014 | 7,194,368 (Over 194K)
10.0M as of August 10th, 2014 | 9,983,454 (Under 17K)
14.4M as of November 23rd, 2014 | 14,762,521 (Over 362K)
18.5M as of January 4th, 2015 | 19,085,306 (Over 585K)
20.2M as of March 1st. 2015 | 20,734,584 (Over 535K)
30.2M as of November 22nd, 2015 | 30,568,994 (Over 369K)
35.9M as of January 3rd, 2016 | 36,667,145 (Over 767K)
Up to this point absolutely no adjustments have been made since I pointed them out in late 2017.
40.0M as of May 22nd, 2016 | 40,125,223 (Over 125K)
47.2M as of November 20th, 2016 | 47,440,477 (Over 240K)
50.0M as of December 6th, 2016 | 50,637,094 (Unknown as this is a mid week update)
53.4M as of January 1st, 2017 | 53,490,988 (Practically right)
60.4M as of June 11th, 2017 | 60,366,899 (Under 33K)
67.7M as of November 19th, 2017 | 68,069,292 (Over 369K)
70.6M as of December 3rd, 2017 | 70,558,427 (Under 42K)
73.6M as of December 31st, 2017 | 73,739,516 (Over 139K)
81.2M as of July 22nd, 2018 | 81,401,414 (Over 201K)
86.0M as of November 18th, 2018 | 86,427,462 (Over 427K)
91.6M as of December 31st, 2018 | ??? (That's a Monday so week ending December 29th should be slightly lower, probably 91.5M)
Won bet with t3mporary_126 - I correctly predicted that the Wii U's LTD at the end of 2014 would be closer to 9 million than 10 million. http://gamrconnect.vgchartz.com/post.php?id=6673287