Actually you pinpointed the real reason HD DVD failed. Nobody except Toshiba wanted to manufacture the units with the possible exception of Onkyo, but those were rebranded Toshiba units from what I saw of them.
That has nothing to do with why HD-DVD failed.
BR on the other hand has tons of manufactures support. That alone translates into more unit sales
Uh, except for one little thing, it DIDN'T translate into more unit sales. HD-DVD won the standalone war, it just couldn't compete with the PS3.
Just because there are 4 different companies making BD players and 1 making HD players that doesn't automatically translate to more BD player sales. Where's the logic in that? It doesn't even make any sense.