First off, I would hardly offer that one of the benefits of this project is that it frees up buses and operating funds for SEPTA to use elsewhere. While SEPTA isn't in a great position in terms of either capital or O&M funding, issues related to the availability of buses can be easily addressed. I don't know whether SEPTA is hurting for buses or not, but how many buses are in service at any one time on those routes? 15? How big is the SEPTA bus fleet? 1200 buses? Freeing up those buses is barely a benefit.
Sure it is worth it. You are right that it won't be easy due to the way the area was developed; that's why there are 6 proposed routings for the line. To start, the King of Prussia rail expansion will ease the pressure of SEPTA having to run all of these buses in closed door service on the highway, only to sit on the highway for hours. With a proper rail line, the 123 line could be discontinued in its entirety, and those buses could be used elsewhere. Perhaps if enough people use the 100 instead of the 124/125, service could be reduced on those lines as well, using those resources for other local needs. This means that from the first day of service, there will be plenty of riders using the line to go to King of Prussia.
The rt 100 serves a variety of communities that don't have easy access to KOP via public transit. That is why King of Prussia Business Improvement District added their own shuttle bus service called "theconnector", http://connectkop.com/transit-options/theconnector/ even though SEPTA is also providing 4000 daily trips to King of Prussia as well. This is a sharp contrast to what happened with SEPTA's rt 71, which wasn't bringing in much ridership at all, leading the Navy Yard to try and get more people to ride transit with their own shuttle service.
The reason why King of Prussia isn't efficiently developed is because there was nothing to really anchor it, and KOPBID is trying to fix that with this rail extension: http://www.visitkop.com/suburban-sprawl-to-edge-city. Plus, with things like the new Casino and Wegmans, King of Prussia is only going to grow, especially with businesses that are catering to local customers [url]http://www.visitkop.com/wp-content/uplo ... 13.pdf[url], regardless of what happens, so why not work to control that with the local suburban high speed trolley line? With a rail connection to Norristown, perhaps folks who live in KOP will be attracted to the inexpensive housing and move into this town to help revitalize it, especially after the failure of the Logan Square redevelopment.
Besides, Wayne Junction (station and substation) received funding, and what happens on the Blvd won't affect the vast majority of people that will be using this line anyway. We also already have a rail line to the Airport (along with a bus that connects the Broad Street Subway to the Airport). Perhaps one day the Navy Yard will be developed enough and harbor enough transit users to warrant an extension of the subway, but why should that prevent improvements to transit in King of Prussia?
Second, in the Navy Yard there are four full-sized 40-person buses in operation. Last I heard they were providing 1200 trips per day for the 10,000 people who work in the Navy Yard. The KOP shuttle fleet are 14 person vans. Hardly a similar operation.
Third, there's no doubt that all of these projects are intertwined. All of these projects require a local contribution of one form or another. Supporting mall development and sprawl is a bad idea no matter how you slice it, whether its to KOP, Cherry Hill, or anywhere else. PA has made it clear that transportation funding, specifically transit funding, in the Philly area is simply not a priority. Whether a change in administration will alter this, we still haven't crossed the finish line on any substantial project in quite some time.
The truth is that we need the region to come together as one and select the project that addresses the most significant gap in our regional transit system. As I noted before, KOP is a notable employment center in our region but it isn't the main employment center in our region - Center City is. Diverting funding away from projects that should strengthen our regional core is a bad idea. I don't believe we should be all in on a project that delivers benefits to mostly Montco and the mall. Philly as a region won't advance if we blow our one shot at expanding our system on a project that will provide isolated benefits to folks that live in an area that is, and will continue to be, horribly congested and represents a diversion of resources from much greater priorities.