If Hamilton beats Rosberg into the first corner then Rosberg hits Hamilton trying to pass him all hell could break out in the team. If Hamilton hits him trying to get past, same thing could happen but I think it will be worse if Rosberg does something else this weekend.
The real shame is as you say, qualifying was likely the only good part of this weekend(though end of fp2 became a bit like qualifying and was pretty good to watch). Shame we didn't see everyone do their best laps. Tires are much less of an issue this season and most importantly Merc being slow as crap at the front of the pack last year because they had WAY worse tire issues than everyone else all year. So at least this year we don't have the worst tire team causing a train.
That could lead to better DRS overtaking as in a train everyone has drs but if the field spreads more there will be more cars without DRS throughout.... hopefully.