Originally Posted by nkhm
We went from vinyl to 8 track and cassette over 60 years.
We went from cassette to CD over 10 years.
We went from CD to Digital audio tracks in 5
We went from standard CRT televisions to flat screen over 40 years
We've gone from flat screen to HD in under 10 years.
We've gone from HD to 3D Super HD in under 5.
While I agree with your principle, especially given who you're arguing with, these things didn't happen in the timeframe you're suggesting, and didn't evolve in the way you suggest either.
CD really evolved from Vinyl, not from cassette, and the CD came out in 1983-ish and was popular by the end of the 1980's. It killed off vinyl and cassettes within 10 years, because the record companies pushed it so hard and also because cassette quality was woeful. MP3s/AACs as a 'major' distribution format, didn't really take off until 2005 or so (when iTunes became the number 5 seller in the US) but had been around for almost 10 years, and CDs are still a lot more prevalent now than vinyls were in 1995. It's taking longer to 'replace' formats than previously, even though they're coming out more frequently.
DVDs are similar - they took around 5 or 6 years to virtually kill VHS, but Blu-Ray will probably never completely kill DVD. Why? Because while even someone with chronic eye problems can appreciate the difference between a VHS quality movie and even an average DVD on a 14 inch TV; getting the full effect of Blu-Ray requires a lot more investment - a 40 inch screen for a start. An upscaled DVD on high-quality equipment will probably look virtually as good as a Blu-Ray movie on a $99 Walmart player and a $300 720p TV from Best Buy.
As for HD to 3D Super HD, that has barely started. You're comparing complete transitions (Vinyl to CD) with partial ones (SD to HD and HD to 3D) or DVD to Blu-Ray.
I'm making this point, because this is exactly the issue with these types of arguments. While a tiny fraction of people still use LPs, many people still buy CDs, even those of us with iPods. HD has barely taken hold, and it's in many standards (720p, 1080i, 1080p) and a lot of 'HD' isn't High Definition at all - we're going to be faced with a decade or so of having no standards. When Hulu calls 1.5MB streaming 'HD', it's hardly surprising no one can appreciate that 45MB/sec Blu-Ray movies are in a completely different league, if they're also called 'HD'.