First of all thank you for this great piece of work, which fulfils a long standing debt to the community. I'm glad SE finally takes this licensing issue seriously.
As others mentioned before I too doubt that a very minor change warrants a license upgrade.
Changing a comma into a period in a written sentence definitely is very minor, and thus most likely doesn't classify as an adaptation of the original work. And as such wouldn't warrant it being licensed under the latest version of the license. The solution here would be to add some sort of minimum threshold. We all know that that doesn't deter users from posting a question, so why would the response here be any different.
On the other hand, changing a comma into a period within a code segment could have major implications for said code. It could be something that fixes or breaks the code entirely and therefore could be seen as an adaptation of the original. Which would warrant a change in license.
As there is no perfect way to classify the impact of an edit, I'd side with Yaakov here, and say that any edit should count, as that is the most practical solution.