Funny: The next Gran Prix is Sunday, again! Usually they make a week pause. I think its the wrongest week ever, to race without this pause...
It's just logistics. There are often a few double-headers during the calendar, and has been this way for a few decades now. This season in particular, Malaysia-Bahrain and Germany-Hungary were already back-to-back, and a fourth couple of double-headers are scheduled for USA & Brazil.
It's just not possible to delay the race. Even after F1's darkest day of the past two decades with death of Ayrton Senna and Roland Ratzenberger in 1994, the races continued, albeit with two weeks between Imola and Monza rather than one (as had originally been scheduled)
The bottom line is Bernie wants to collect his cheque from the Russians, and wouldn't do such a thing as cancel the race on compassionate grounds for an injured driver. Probably the FIA will make an emergency rule that states cranes can only enter the track under Safety Car conditions from now on or something, but apart from that little will change.
Holy shit... Never thought something like that would happen with todays safety.
Today's safety is what stopped him from being killed on impact. The amount of new technology and crash testing that has gone into helmet design is unreal. Also, the FIA mandated higher cockpit sides after Wurz and Coulthard's collision at Melbourne in 2007/8 (can't remember which year exactly), which will also have helped shield him slightly.
All the main crash structures apart from the front bulkhead were completely destroyed, which will also have helped dissapate some energy, but likely the main cause of Bianchi's injuries will have been the G-forces involved in the crash. The HANS device, which attaches the driver's helmet to the car to stop the neck flying forward in a head-on collision, is very effective at resisting longditudal G, but doesn't offer as much protection from lateral G. The g-force of the extremely sudden stop from hitting the tractor will have caused the brain to hit the skull and caused his intercranial bruising. The modern safety features did what they were designed to do, but sometimes luck just isn't on your side and the one weak spot that's hard to account for is exposed....