idk what if anything has been decided on this but I agree with toonaddict "if i have to pay something to get a solo instance, i won't do bh's any more than i can do them now. if you limit the wine duration, i won't do bh's because even taking alts with me to do the instance, i'm not likely to finish an entire instance with hard (for me) bosses in the time proposed."
I only run bhs with/for my low level toons now since I can't solo some of the bosses in the bhs for my main toon and rarely find anyone willing to run with me.
my thoughts on limiting wine time - a wined instance of bh 51 can take up to an hour, for me, to run an alt through - if mobs respawn because the wine "ran out" I would be really POed! I don't want to waste my time farming the wine, click click click clickclick click click click ( 5 clicks per wine) to get 2 wines, spend 10k (5k each toon) to use the teleport stone, talk to old man in dungeon, again click click click click, wait for mobs to disappear, only to have to fight mobs when the wine "runs out" because I can't kill the bosses fast enough!