In a traffic jam some years ago, nikki and I came up with The Brick Theory™: That if you molish buildings from bricks (including stone), they still look pretty good even after many years (indeed, centuries) of neglect, but all other materials (especially concrete and plastics) tend to look awful after a decade or two of non-maintenance. It's not that brick is immune to weathering, so much that it still looks aesthetically pleasing as it does so.
I'm reserving judgement on clip-on brick cladding, but my gut feeling is that it'll continue to look decent for quite some time, before whole chunks of it fall off onto unsuspecting passers-by.
