Well, Echo and Shindaiwa are part of a common company now. I know that they make some big saws, but mostly see them in landscaping use. Still, good Japanese engineering, the right marketing (think Toyota, Honda, Nikon, Sony, Panasonic), and a support network could really get them a big part of the intermediate market that now buys Husqvarna.
Makita and Dolmar - I hear good things about (and I know that there are some dealers and users following this thread), but doesn't seem to have the dealer network. They could also give a reborn Jonsered a run for their money if they choose to compete.
I know that Homelight and McCulloch still benefit from strong name recognition, even though they are not the same saws as those that build those reputations. Names like Jonsered, Partner, and Pioneer were not ones that I had heard of until I 'got into' chainsaws, so I am not sure how they will do with a mass market appeal. Jonsered in TSC sounds surprising to me. I would have put Poulan or McCulloch there.
Philbert