Tyriless, I have to respectfully disagree (I'm not verbally attacking or trolling you, I just disagree with any action based series becoming a musical and using this opportunity to share my opinion and read yours and anyone else's response).
I see the point that you're trying to make. Musicals portray fantastical stories and the amazing story of Spiderman is fantastical so why not put the two together? The reason for that is presentation. Spiderman is at its core a story of action that has kept fans with its deep, constantly evolving plot. However, at the end of the day when Peter has learned his lesson, hugged Aunt May and kissed MJ we want to see him punch someone, in the air, on a line of web, while flipping unnaturally upside down.
Yes there have been some musicals, even some decent ones, that have had a sense of action. However the action is very little since the whole point is to portray the plot and characterization through songs. Sweeney Todd and The Lion King were used as examples. The Lion King was already a musical and the characters spent most of the time walking and talking so turninig it into a broadway number was not a stretch. Sweeney Todd is a story of mystery and suspense, and yes he kills people but that isn't the main event of Sweeney Todd, just results after he sings about his emotions, motivations and insanity.
Sure, there have been those musicals and plays with people on wires but there is only so much that you can do with suspended wires before you hurt or kill someone. Movies are suspect to the same dangers yet they can also implement greater measures of safety than stage productions.
Another point I want to touch on is the story itself. I get the feeling that this isn't a SpiderMan story but instead the director telling his own story through the use of SpiderMan elements. For example, why does the spider that bites Peter Parker need to have a vocal role? That defeats the purpose of the spider bite scene. It was quick and any viewer who was new to Spiderman would quickly dismiss the bite because nothing happened at that moment.
However, here is where the story starts its magic: when Peter starts to feel weird and becomes sick, the viewer starts thinking back and wondering, "wait a minute, is this from that spider bite? What kind of spider was that and what is it going to do to him?" The spider bite is supposed to be quick and thoughtless especially since the viewer is purposely distracted by Peter being bullied while he's trying to figure out what to do about his MJ crush.
So now that the spider sings along with other director inspired changes...well I guess we'll just have to wait and see how the director's vision of "Turn Off the Dark" twists the spideman story.