Betecam is the professional "cousin" of betamax. It's never gone away, it rapidly became the standard for news cameras, then overcame the better but far more expensive and cumbersome formats used in editing/boradcast markets, then it was when it went digital that standard really took off, and in its latest incarnation it's a dominant HD format, used even in digital cinema. Same size of tape as the consummer betamax of old (really different recording systems, though, but all from the same company).

Blu Ray is here to stay a while. Alas in a way, because its rather disappointing compared to full uncompressed HD, but even for the really good consummer grade TVs and screens, it's good enough (in a professional screening room, the difference between BR and the original source is rather unmistakable). There's still room for much technical improvement in the home market for it to catch up to the quality of the HD sources, but there's no way the MPAA and co. would even support the introduction of something better much better than BR on the consummer market in a foreseeable future.