Nobody detests a modern bridge more than me, but even I have sometimes posted photos of a replacement bridge on HistoricBridges.org on a historic bridge page because I think that one of the best arguments in favor of historic bridge preservation is a "before and after replacement" comparison. Here is one I did: http://www.historicbridges.org/truss/frith/photos6.htm
I however will NEVER go out of my way to visit and photograph a replacement bridge. Gasoline is too expensive to waste on such things. To that end, Street View is valuable.
A few thoughts on this bridge:
The NBI stats appear to indicate that this bridge was functionally obsolete, but not structurally deficient. This is not that uncommon with Marsh arch bridges. The bridge was clearly too narrow for modern traffic, but it appears that the bridge still maintained structural integrity.
I don't think that the streetview itself is an insult. One could make a case that the UCEB is, but IMHO the streetview serves a good purpose by showing everybody what the site looks like today without somebody having to actually photograph the UCEB. I know that I am not going to drive out of my way to photograph a modern bridge.
I am glad that somebody got photographs of the old bridge, however. In fact it was the demolition of another Rainbow arch bridge that got me started uploading photographs to this site. That bridge can be seen at: http://bridgehunter.com/ks/ottawa/bennington/
That streetview is an insult to the original bridge.