I don't think that's fair, to be honest. If such a penalty has not been handed out thus-far, I don't see why they should start now. It would add yet more to the inconsistency debate. If such a ruling had been imposed at the start of the season, I'm pretty sure Lewis wouldn't have run in to the back of Kimi, and Nico in to the back of Lewis, at Canada earlier this year.
The rules cannot get any worse, in my view. Some drivers are being penalised for leaving their pit box earlier, where as some others are not - and this is happening in GP2 as well. At a lot of other tracks, one can get away with leaving your pit box early in a situation that the regulations deem unsafe because there is enough room for two cars to go side-by-side. At this track, however, you can barely get one car down the pitlane safely, never mind two. If you were driving up the pitlane having completed your stop and another driver suddenly came out in front of you, you would have to slam on the brakes so as not to him, losing a hell of a lot track time as a result. The offending team and/or driver would benefit from leaving his box in an unsafe situation. This is unfair and must be punished.

Ayrton Senna: WDC 1988,
1989, 1990, 1991
McLaren: WCC 1974, 1984, 1985, 1988, 1989, 1990, 1991, 1998,
1999, 2007McLaren: WDC 1974, 1976, 1984, 1985, 1986, 1988, 1989, 1990, 1991, 1998, 1999, 2008