I think some rationalizing is in order, here.
I completely agree that aesthetics and finishing materials are definitely important (at least at a basic level on what should be
excluded), but even as far as Philadelphia's major/prestigious commercial corridors, I don't think this comes close to being the worst offender. For example, let's not forget the suburban-style Wendy's atrocity on Walnut street:
https://goo.gl/maps/ANFRQrC9MmP2. Nevermind the many drive-in/auto-oriented uses on
Broad Street. I'm sure everyone can think of far greater offenses on a grand scale of urban aesthetics.
I also agree that people over-estimate political bandwidth, and not to mention constitutionality, of trying to legislate and enforce something like building materials. I can't think of one large city that would not have at least 50 more pressing policy issues to consider. One can decry the lack of intelligence of Philadelphia's elected officials, but the fact of the matter is that an all-too-high poverty rate or violent crime issues are infinitely more important to policy-makers, as well as the general public. This design-obsessed forum frankly only represents a very small, niche subset of the population.
That being said, I think there is a middle ground here. While it is important for property owners to consider the context of their surroundings and respect the existing built environment, I don't think there should be an unintended consequence of precluding non-design-conscious but otherwise well-intentioned small business owners from having a place in Center City.
There are certainly programs in place already that provide grants for small business owners to improve their facades, which is a great start. It'd be great if something like that could be expanded. Additionally, the idea of crowdsourcing something like this is fantastic. I'm sure if there was a citizens group that approached businesses like this pragmatically to help them improve their facades in a much more context-sensitive way, they would be very receptive. Again, the property owner likely did not mean to cause offense, and would prefer to do something much better, and it is 99% likely this is purely a financially-based outcome.
Lambasting people for their lack of care, sensitivity or intelligence will not help the effort for better design. Why not come up with a workable, rational solution?