I suppose that there would be a disadvantage with not being able to share a single game library with an entire household due to only being able to log in to a Steam account on one device at a time. What could work, though, is a structure where you were allowed to set up a couple of sub-accounts under a main account and the main account could assign games within it's games library to either itself or one of the sub-accounts.
I think there is all the solutions in the world on every DRM platform, why not just random checks every 2nd month on licenses, without the user noticing, long grace periods, infinite sharing from the same / household / IP etc, make the DRM go away from the user perspective and everyone is happy.
I just think it's completely stupid to "own" 152 games on Steam and being able to play 1 at a time, off course there is the offline option, which afaik, is against the TOS. And i am pretty sure they keep tab on which games are played offline..
But as i said about DD
You are basicly subject to the fickle nature of copyright holders and greed, not to mention general capitalism.
I don't know how the 360 works without Live access, can you play everything forever? Or are there circumstances (i think i read about it but i am not exactly sure how it works) where you have to be logged in , in order to play? I just know that in the short period of time that i have had a 360, i have seen Mindcraft complain about Live connectivity more than one time.
On the PS3 i am constantly nagged about i should log in if PSN is down. But the games are activated on a per machine basis.
Uplay (Far Cry 3) GW2 and Pc games alike, keep on pestering me for updates that i have to download in order to play. If i go offline with Uplay, i loose my Cloud saves.. but at least i have the option.
IMHO, DRM and DD doesn't just "work" like a CD or DVD usually does it adds an extra layer of uncertainty where you really don't know when the next problem creeps up.
But our friends from Microsoft and Sony has every chance to get it as right as they can on the next round of consoles. And i really hope they do