Uber-SPG Partnership will End on December 17

You can currently earn 1 SPG point per $2 in Uber spend by linking your accounts. Unfortunately, this partnership will come to an end on December 17, 2017 at 11:59 pm EST.

The SPG media team put out a small FAQ on Flyertalk about this:

Frequently Asked Questions

When will members stop earning Starpoints on their Uber rides?
Members who have met all of the requirements to earn Starpoints in accordance with the SPG-Uber benefits program, including, without limitation, having a Stay posted to their SPG Member account for the current calendar year will continue to earn Starpoints on Uber rides up until 11:59PM on December 17, 2017, subject to applicable limits.

If members have a stay that overlaps with the program end date, will they still earn 2 Starpoints per US$1 spent on Uber rides taken during the stay?
Yes, members who check-in for a Stay prior to 11:59PM on December 17, 2017 and have an Uber pick-up time prior to 11:59PM on December 17, 2017, subject to applicable limits, will earn 2 Starpoints for every U.S. dollar or its foreign equivalent denomination spent for fares on the Uber ride(s). Any rides taken after 11:59PM on December 17, 2017, even if taken during a stay that originated on or prior to December 17, 2017, will not earn Starpoints on the Uber ride(s). To earn Starpoints for any Uber ride the member must have met all of the requirements to earn Starpoints in accordance with the SPG-Uber benefits program, including, without limitation, having a Stay posted to their SPG Member account for the current calendar year.

Why did I recently have a delay in my Starpoints posting for my Uber rides?
An issue was identified affecting Uber rides over the last month that delayed the posting of points to member accounts. We have since fixed this issue and members should receive all ride credits within the stated 2-4 week period.

I assume the change is related to the new Uber card which will launch soon, though there are probably other factors too.  There aren’t any other ways to earn miles with Uber, but you can still earn Delta and Jetblue miles with Lyft rides, and there is an ibotta offer for Uber.