I seem to post in one of these or a similar thread every few months but still.
Porn: Westside said all I would.
Copying: seem to be fairly even these days, perhaps a slight edge for HDDVD but if you can copy then spending 30 more seconds or using the command line probably will not bother you. This BD+ lark may change stuff however.
Quality difference, I can see the difference but only because I trained myself to do so over the course of hundreds of hours encoding stuff. Of course this can be dropped right down when the companies screw up the encoding stage (which with the standards that have been defined, the resolutions used and comparative lack of disk space is all too often). DVDs were/are a genuine step up from previous stuff (VHS, betamax, VCD, SVCD, laserdisk (OK so laserdisks are usually better mastered)
Market penetration: "everyone" has a TV, monitors aside (which may or may not be able to be used courtesy of "piracy concerns" and are "too small") hardly anyone has an "HD" capable display. This makes for an uphill struggle in my world, factor in serious screwups in defining standards: the i/p nonsense, more acronyms than you will ever need all of which have some relevance.
Personally I would have preferred to see something like a new standard with the same discs becoming the norm using MPEG4 AVC instead of MPEG2 say, for example:
Old mastering equipment still works (what better way to make sure loads of new discs get made), sell some software and all the small places and home users can make their own stuff as well (I can make DVDs which places me fairly high in some peoples worlds, those same people have no trouble burning a CD full of their favourite songs though).
"dual video" discs could conceivably be made: check if XXX exists, if err goto DVD. Space may be a problem but I guess you could drop extras like with some of the new DVDs (extras frequently run to nearly half the disc) then you could easily gain the 1000 odd megs required.
new "copy protection" methods and region coding could be employed appeasing those who do not know better: see above
PC wise old hardware would still work (just a software "upgrade" required)
you could still sell the specs at a ridiculous price: again a great way to increase takeup: I only need a $20 upgrade, sign me up.
quality could be made better without question (take a decent DVD and I can make it smaller without a drop in quality and I am an amateur)
standalone playback hardware would not be all that expensive to produce (stuff to decode AVC is not that expensive, ASP (xvid and co) is even less, no need to futz around with blue LEDs either): how much is a 1GHz junk (130nm) processor these days?
Quite how it would figure in I do not know but you could add a "HD" out port to the player
Guess whoever signed off on specs missed basic engineering/market analysis, I suppose you are never too young to start towel flicking your way to the top though.
Edit: Thought I would add a comparative example.
I am an engineer and I called up to design a car for the mass market, "so be it" and I put a team together.
Cue scene involving drawing board and screwed up paper balls
Inspiration
Cue scene 3 with me standing over a guy on a computer whilst I point at a CAD image.
Presentation day:
here it is a hydrogen/gas (as in natural gas not petrol) fuel cell with tantalum capacitor bank driving a superconducting motor (fancy, high tech and arguably "better" than petrol)
"there are about 30 places in the entire country I can "fill 'er up"."
Scene 20 years later: I am working in a supermarket because no other person will employ me after that stunt.