: Getting BluRays pressed is still somewhat expensive, since unfortunately they
: aren't as ubiquitous as DVDs.

Which can in turn be blamed largely HDTV not yet being universal. Only 77% of U.S. households have an HDTV. Meanwhile, color TVs were in over 80% of households when VHS was introduced and in over 95% of households by the end of the 90s. By time DVD hit the market, essentially every household in America that wanted a color TV had one, and once DVD players became affordable adoption rates exploded, going from about 10% in 2000 to around 70% by 2004. It was the most rapidly-adopted consumer tech to date.

Blu-ray has had to deal with having came out at a time when HDTVs were not in many homes. When Blu-ray was first made commercially available in 2006, less than 10% of U.S. homes had an HDTV. HDTV didn't reach 50% penetration until 2010, and at this rate it's still going to be at least a few more years before it reaches 90+%. It may take the remaining CRT TVs (which were discontinued by all major TV manufacturers some 7 years ago) to push the remaining holdouts into buying HDTVs. While total Blu-ray penetration is still at just under 60% overall, it is in 75% of HDTV-owning households (and climbing rapidly; in 2012 only 25% of homes and just over a third of HDTV homes had Blu-ray).

By the end of the decade, I suspect Blu-ray will have finally become near-universal, but for now, with nearly a quarter of households lacking HDTV and thus having no incentive to buy Blu-ray, Blu-ray will not displace DVD quite yet. It'll get there, but it'll take a little while.