It would save them money
Storage Class Memory would allow them to stop having their battery backedup ram that they use to store writes before the "disk" have responded.
There have been rumours that NetApp plans to move into the hyper-convergence market, followed up by The Reg's Chris Mellor here. If they are indeed true, the intention shouldn’t be a surprise in some respects. As the storage market fragments, the incumbents have to adapt to the needs of customers, and hyper-converged systems …
The real innovation here is SCM and not the "packaging". Storage vendors will continue trying to sell you a box with secret sauce, when the real performance gain comes from the storage medium.
The photography industry made lots of money selling film until digital photography arrived. The storage industry is trying to put flash or SCM into film roll and sell it as their own innovation.
Your analogy sucks. Photography industry is still doing fine selling cameras, lenses, and other associated equipment. Film companies died. The market changed but optics didn't change because the recording medium changed.
What you do with any medium matters greatly. You can easily make a platform with SCM and it can suck. Really suck. I think you have misunderstandings on how many engineered products work.