Your idea's good in theory, but there are a couple problems in execution:
1) People have become accustomed to receiving that much oomph out of a box, and taking it away will probably result in less product being broken knowing the hits are few and far between.
2) Taking away the common status of an autograph or jersey hit won't necessarily negate their common status on the secondary market. If there are 17,000 Kaspars Daugevins autographs out there already, scaling his autograph back to a rare hit won't really help because there are still 17,000 of them out there.
3) Just because one company does it doesn't mean all the others will follow suit. If ITG decides to make their jerseys one a case, and Panini continue doing 1 or 2 per box, ITG might see their business drop while people continue to chase hits. We're conditioned nowadays that if you see a box being broken at a show where people are buying loose packs, and nothing comes out, collectors know "Well there are still 2 autos out there" and continue going back for packs (I'm guilty of this as recent as the last show watching people pack break a Contenders box realizing the big hits were still obtainable.) It's still creating good business for hobby store owners.
4) Because we've been conditioned, or conditioned ourselves to the way we are...I can't say this enough: A product with astronomical odds to pull "something" nowadays will not sell. Look no further than 07-08 Between the Pipes. You got 1 auto and 1 memorabilia per box, but because the chances of hitting something decent were so thin, boxes were collecting dust at $30-35 a pop, which is crazy to think since we were scooping up set builder boxes like Score and Pro Set for that much back in the day without looking back.