Here's the thing; is the connection to EVE mechanics so important? What if there was another option that could be just as fun, just as deep, but worked within an FPS format?
Loyalty Points, building up rep with a faction, flaunting my Gallente LP store armor? Not there. That's the depth that could keep me playing, not SP boosts.
What you're talking about is a very different sort of depth. It's one I'd like to see, but which seems to be at least as tricky to add. Probably trickier. Also, it's not inconsistent with the kind of depth the fitting system takes.
What is so important about the Eve-style fitting is the flexibility and variety-- the room for imginative fittings and unorthodox tactics, and also for bungling things horribly and learning from mistakes. For example, my current favorite scout fit involves two sidearms (SMG and nova knives) and no primary "light" weapon. This, on its face, under-utilizes suit resources, but the net effect works frighteningly well.
The fit I use most often is efficient and affordable, meshes with my personal playstyle to near-perfection, and, best of all, is mostly something I pieced together myself over time out of a wide array of options. Piecing it together is something I actively enjoyed doing.
I am the sort of person who has been disappointed in the slowly-decreasing selection of skills, weapons, and even armor pieces in the Elder Scrolls games. I like my choices in a game to have meaning and variety, and, in general, the more a game challenges me to think, learn, and adapt, the more I enjoy it.
It's likely that Destiny will be just the sort of game you're talking about, Reyd. It's going to have a sort of dynamic ecology; did you hear about that? Fascinating stuff; apparently Bungee's not planning on scripting the changes and development in the world, instead letting it develop itself organically. If they can make it work....
But I have worries about their class system. Classes are often more than a little arbitrary and limiting. I want stealth options, but I'm not sure I want to play a Hunter; I like sniper rifles, but what's this about six-shooters? I'm okay with the "space magic" of the Traveler, but ... must I really go about "enchanting" my guns?
In DUST, I design my own character class. It's shaping up nicely. If that means having a few less playmates, well, that might be a problem taken to an extreme, but I think CCP would really be better off embracing the niche-ness of their game. People who are intimidated by the fitting aren't likely to be fans of AWOXing, corp theft, and scamming, either.