Happy that codeigniter is finally moving forward.
As you wrote, there is no better time than now to break backwards compatibility for a good of a project. With a longer support of version 3 there will be no problem with it. The benefits in the future will be notable.
As far as I can understand other decisions, I think all of them are the best possible. In a more abstracted way, the speed, simplicity and flexibility are the pillars of CoreIgniter from the beginning. That is why I am using it. Thank you for your work and good luck with a new version. :-)
my startup relies heavily on codeigniter, i was worried when I didn't see any updates in codeigniter, because this is the most easy framework i've used, i don't know if it is best among all or worst, but for me it's my bread and butter, i thank you guys, and once we reach upto certian level, I'll personally fund this project