but slowing down like this at this point in time is normal, (and I assume expected) successful projects and failed projects alike.
I totally agree with you, this slow down is expected. But, whereas some projects that get funded will have this slowdown close to or already after their goal* if at all, the Ubuntu Edge project is stalled at about one third of their stated goal. We can safely assume that everyone wanting a Ubuntu Edge, knowing about it, and with the money for it already donated. There will be no geeks pledging for the phone at the last minute. So, either at the end someone with lots of funds (and possibly connected to Canonical) just orders around 30 thousand of these phones so that the goal is met, or this campaign will fail.
* NOTE: I'm not trying to focus on the issues discussed on the Slashdot thread I linked to. Merely to the money they made relative to their goal.