I would love to see Perch continue to be developed to v4 but I understand that isn't possible now.
I think Perch is a fantastic CMS which is perfect for so many of the sites I and many others work on. The fact it allows you to admin as much or as little of a site as you want (with so many fantastic out of the box content editing options) and still keep streamlined markup without having to download multiple plugins for performance is great.
I for one would be happy to continue to use Perch on my sites as long as there was some sort of guarantee that the first party add ons provided and the core were kept compatible with the latest PHP version and there were security patches if there were ever any issues. If there were any important support issues, like those listed in the posts above it would be great to hear from Drew also.