No, it wont. However, it will give him a reference point; more accurately, it will give us a reference point. This is what I want my speakers to sound like, what can you recommend? This isn't what I want, can you recommend something that sounds different? It wont give him any idea what to get, but it'll give us an idea of what to recommend for him. It'll also give him a great example of imaging, it's really really fun, and he has nothing to lose.
The OP seemed kinda hesitant to go with the PSB, but the good reviews on here appear to be swaying him. Perhaps if he hears one of the excellent speakers suggested, he'll decide the PSB was good after all, or maybe it wasn't. It gives him a taste of "true" neutrality, and IMO, a taste of what HI-FI is all about.
Personally, I listened to PLENTY of speakers before I listened to the Salon 2. Had I not listened to it, I probably would have purchased one of the other speakers I heard, and settled without even knowing it. I don't feel I settled for the Philharmonic 2, but I do feel I would have settled had I purchased the B&W CM9, or the Dancer Mini One Diamond DMD.