Indeed, I know some hacks were being held back until end-of-life. For example the author of SoundHax (one of the most important tools in 3DS hacking) said he was holding something off: https://twitter.com/nedwilliamson/status/874594459744423936
However this all assumes that updates will stop, and I'm not so sure that Nintendo would even announce such a thing.
However this all assumes that updates will stop, and I'm not so sure that Nintendo would even announce such a thing.