Because both Google and Apple can scan the apps for code that would tap this issue, this means that for most of us this is a non-issue. Only folk that get apps from other than the store would ever worry about this.
I have been trying to keep all my devices updated and patched since this flaw was revealed and hardware and software makers have been patching the flaw with workarounds. Some of my newer computers got a BIOS update. All my systems run Windows 10 so they got an OS update as well to deal with these issues. These are all a workaround and not a true fix from what I understand. The issue won't be fixed until it is changed at the hardware level.
Anyway, my phone is a Galaxy Note 8 so it got the recent patches. My GF is currently using an older Nokia Lumia Windows Phone that hasn't been updated to Windows 10 so it isn't getting updates. Various apps have quit working because the OS is no longer supported and considered insecure.
She isn't a phone person but may have the option of getting a free Galaxy S5 that simply needs a new battery. I know that the Android OS will never be patched but the apps still get updates. If all the apps she needs/uses are updated, how big of a concern is this flaw? I know the Chrome browser and such is immune as of now but what about the rest of the system? She would be getting all apps from the Play Store and such.
Conor

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic