I can't remember GM saying anywhere that they are changing to lifetime, though I wouldn't hold a grudge if they did

But... which other GM thread did you see that?
Here apparently.
https://bitcointalk.org/index.php?topic=768281.msg8747062#msg8747062Although GM didn't actually say that they were, just that another forum member that said they had.
I think Genesis- mining need to concern this matter. It would be really helpful for old members like us.
This is old news now. This was posted before the announcement yesterday from Genesis Mining that they had lowered prices once more and are now offering contracts that are a lifetime.
All those with contracts which were purchased before that change, will be upgraded to the lifetime contract when their current contract ends, for example my contract started in May so when mine finishes in May 2015, then it gets changed to a lifetime automatically.
Ian.