It does look like it will be a relatively shallow system, at least for what they've shown so far. I believe there was an image of a corvette requiring some amount of crystals to manufacture, so it seems reasonable that that was the "rare crystals" resource shown in some of the more recent screenshots. If they're representative of what the system will look like, there will probably only be maybe 3-4 "rare" resources like that, which will probably be abundant enough that if you don't stay on a single planet you'll probably always have at least some income of them.
Which is okay, I think. Anything more complex than that would probably be needlessly tedious and irritating. If ships took 5 resources to build and you were only likely to have 3 or so yourself and always had to buy more, that would be annoying. It would be nice if some specialized components did require special resources you can't get otherwise, like dark matter tech requiring stockpiled dark matter or neutronium armor requiring stockpiled neutronium, but it sounds like the jury is still out at Paradox on if that's how it's going to work.
Shifting gears a bit, does the crisis strength impact how powerful awakened empire fleets are during a war in heaven? I actually got one of those last night, finally getting my wish to be in a defensive war and with painful results. I wasn't afraid at first, since the fleets parked in fallen empire systems usually hover in the 50-60K range and I could easily beat those if I pooled my fleets, but the fleets that came knocking were in the 120-160K range, which were substantially harder to repel and caused massive damage before I drove them off. Side note: I hate worm holes now.
Also, does the war in heaven count as the end game crisis, or am I still going to get the Contingency (there is more than exactly 1 robot in the galaxy, so it will be the Contingency).