Regarding Rose... I say a resounding YES.
Regarding the others...
Bonds - Yes
McGwire - No
Palmeiro - No
Canseco - No
Sosa - Yes
A-Rod - Yes
I really don't care for the steroid-era players, but think some will eventually be considered, given the era they played in. They did cheat, but some would have made the Hall regardless (and I think the passing of time may be kind to the cream of the crop). I picked Bonds, Sosa and A-Rod, as all three will end up with over 600 HRs and I feel they were the best of the bunch that you laid out.
Just a gut feeling, and not based on any fact. I don't personally care for any of them... just guessing what may happen by 2020 or so.
