It isnt financially viable for two formats for the makers of the players with consoles they use the higher price of games to keep profits higher, hardware players cant and people will go with 1 over the other, it is the nature of people
sorry but that is complete rubbish
there are tonnes of DVD player manufacturers & they dont make money from the titles released so there is no reason for it to not be financially viable
as for the nature of people - petrol cars/diesel cars? Play station/Xbox MP3 player/ Minidisk player
no real reason why people will all want the one particular format over the other