If I were wanting to attract a new (younger) generation of player to the PRS brand, I wouldn't do that with a Grissom SE model. While us old farts might appreciate it, it's not the hook that going to snag these players away from Ibanez, Fender, etc. But what do I know...?
Oh I get it, as far as signature guitars go, Grissom might not be the best ambassador for a brand. To be honest with you, I only know of him because of his PRS model, and I couldn't name anything he's done. But, if his guitar fills a niche for imports in the market, then it will find its place in the market.
As far as the other names they would try to pull customers from, I was one of them. I was playing primarily LTD guitars, went down the Fender road too, but more recently started playing Gretsch stuff. I play everything from metal to CCM worship, and my SE covers all of those bases more so than the other brands. And it was seeing John Mayer playing with Dead & Co this summer that made me rethink PRS, but it wasn't his Silver Sky, it was that Super Eagle I think he was playing.
I guess my point is, a signature model/brand ambassador can do a lot for a brand, and having more signature models in the import SE line will help bolster the idea that PRS can cover so much ground, more so than other brands, whether the signature model is niche to the brand or not, it might open someones eyes to possibilities of a brand they might have often overlooked.