Which only goes to say that I don't know of anyone who has chosen to misunderstand things in the way that you have chosen to misunderstand them. But I pointed you at a list where you can ask, and you are likely to be answered by multiple lawyers who are deeply involved in free software. (And therefore should be expected to understand the GPL v2 pretty well.)

To answer your specific question, the phrase these terms and conditions in the GPL v2 do indeed refer to the GPL v2. Section 6 therefore says that if you follow the GPL v2, then anyone who receives the Program from you automatically receives a GPL v2 license for the Program, and you may not restrict their free use of the permissions that the GPL v2 provides them. Which, if your modified version is offered under the GPL v2, you haven't.

This says nothing about what other licenses may or may not be available to the recipient under what terms. Just that the GPL v2 must be available, and you must not impose any restrictions on their freedom to use the permissions granted by the GPL v2.

As for whether anyone has thought about this topic, when the GPL v2 was drawn up, certainly people thought about the issue of how to migrate from version to version. After all license migration was at the time an interesting topic, considering that they were trying to figure out how to migrate from the original GPL to the GPL v2. That's why the GPL v2 has instructions for people to follow which were meant to smooth the way to the GPL v3 when that came around.

Cheers,
Ben