Hi kwicky,
Sadly there is no 'standard' anymore as it's all down to the manufacturers trying to make us the consumers want the next best thing.
Back in 1999 DVD was the new kid on the block and quickly killed off videotape( which had been around since about 1979), now 8 years later we have Blu ray and HD DVD. There will probably be something even better just a few years from now and the process will start again.
You only have to look at the advancement in mobile telephones over the last 5-6 years to see what I mean.
It's the same with tv's, at the mo everyone is after HD ready plasma tvs, but how many are going to fork out for a Sky HD box and a monthly sub (or Blu ray DVD and discs) to actually watch the few HD channels that are available?
As for DVDrs many will not last half as long as the good old VHS. In a few years pople will find all their precious recordings will be unreadable by the 'latest' machines and a whole new industry will be made out of recovering archived DVD films / family videos etc.