Ashley
Therefore addon developers have, as a minimum, over a year to update their addons (one year starting from the next stable release). We will review this schedule over time and milestones may be delayed if necessary, but we are publishing this as a guide for addon developers to plan with on the assumption that this schedule will be adhered to.
I would like to request that this timeline be extended to at least 2 years. Not because it takes time for us plugin developers to port the plugins to Addon SDK v2, but because I doubt the API will be able to catch up with the needs of the plugin developers.
For context, it's been 5 years, and the scripting interface is still incomplete. It's only recently that the majority of the features have been interfaced with the scripting API, but that's still only relative to the event sheet.
Assuming it took a year to cover all essential APIs for the plugin developers to get to work, which I doubt, they still cannot just instantly port all the plugins; additional time is still needed.
Even if the plugin developers can work concurrently as new APIs roll out as new update releases, you cannot expect them to, especially those who are doing this only out of the kindness of their hearts for the community in their free time.