The reality is that there is that there is still a large user base using Joomla 2.5. We cannot change that. Even a couple of projects that I have worked at (some with origins in 1.5) are going to stick with 2.5 for the moment, mostly because of the financial aspect.
I think the need for support will naturally fade away, as it did with Joomla 1.5. It just requires time. We would all like to have all websites overnight jumping to 3.x, but it is not always that easy. So we can help propagate, but we cannot chance the fact itself.
Regarding the information aspect. The last update to 2.5.28 will bring with it a new plugin which will cast a clear message that this version has reached EOL.
Adding text to all existing questions might be a fair approach. But it can be time consuming and somebody needs to commit on the long run to maintain this message. At the time of this writing, there are around 200 questions tagged with
jooma-2.5. It is some work to edit so many questions.
Considering the above mentioned aspects, I propose as follows:
- Update the joomla-2.5 tag to reflect that Joomla 2.5 has reached EOL.
- Do nothing else.