Hi Brian,
It's great that the change in weekly meeting time is considered, here are my opinions on the same from the perspective of Asian countries (having active upstream developers)
Current meeting time (16:00 - 17:00 UTC)
INDIA : is 9:30 - 10:30 PM IST (UTC+05:30) is a little late but manageable.
CHINA : is 12:00 - 01:00 AM CST (UTC+08:00) is almost impossible to attend.
JAPAN : is 01:00 - 02:00 AM JST (UTC+09:00) similar to the case as China.
IMO shifting the meeting time 2 hours earlier (UTC 14:00) might bring more participation and would ease out timings for some (including me) but these are just my thoughts.
Thanks and Regards
Rajat Dhasmana