Last time I checked the majority of third party games are on the Wii and like the HD consoles they have a modest ratio of successful to failure - the flops don't hurt as much but the big seller arn't reaping as bigger rewards.
I really don't see what third parties are doing wrong now - sure they 'bet' on the wrong console initially but all the publisherss I can see are adjusting accordingly, putting alot more software on the Wii.
Quick example - EA - they're releasing a Wii game every fortnight before Q3. I don't see a release list like that for the HD consoles.
There are a few publishers / developers who focus entirely on the PS360, but most of them are still in the black and have a sustainable business model.
It always make me laugh when people cite Capcom's 95% drop in profits, I find it incredible they're still in the black with what people say on here. 7 HD projects simultaneously in developement, no HD release thus far this fiscal year (The report is before SFIV) and little to no Wii success in the fiscal year, yet still profitable? Wow.