i think dvd will stay as the cosumer favouite standard.
but as for hddvd and br i think itll just be enthusiasts like ourselfs that own a hddvd or bluray machine until another 6-8 years down the line we see another format which everyone will go to (ie. vhs vs dvd)
as for hddvd/bluray vs dvd at the moment though its just going to be sacd vs cd vs dvda IMO (sacd hardly flys off shelfs nowdays).
as for the format after hddvd/bluray i think its going to come back to dvds but its going to be them rumoured dvds by toshiba or whatever i think (rumoured to hold 1tb!)