1. These we cannot assume as invulnerable or always accessible1. fuel reserver I'll not comment on, but they would last for months and certainly more than a week, even in case of embargo or a blockade.
By war stocks if you mean inventory of spare parts than again that is cognisant with use, should last more than a week.
2. Losses on the ground, yes in case they are able to surprise us or they are able to repeatedly launch successful attacks against our airbases especially crucial air bases. But why one week or lets say even two weeks..
About ground losses, we need to temper it with actual lessons for history. The last such successful campaign was by USAF again Iraqi air force in first gulf war. USAF+USN+ allies had lots of advantages and force multipliers over their opponent, for example, they had AEWACS to provide a better situational aware, satellites and lot of other sensors to identify targets as well as identify damage in real time. EW prowess in shape of Raven etc. to completely jam up Iraqi radars, advantage of 4 to 1 in numbers and that with huge qualitative difference as well plus growlers and prowlers to even make radio communications between wingmen a feat. And most importantly, Tomahawks. These were extremely accurate, iraqis had no answer to them and US launched them in hundreds (I think if I am not forgetting or mixing things up more than 800 were launched within initial stages of campaign) against lots of command and communication targets especially related to Iraqi air force as they wanted to neutralise it before moving to other targets, so as to give them a chance to get inside iraqi decision loop. Still with all this what was the tally? 220+ out of more than 900+ aircrafts (all aircrafts not just combat fighters/bombers)
The record of losses in air is actually even more dismal but I'll suffice it to say that chances of a 'turkey shoot' are higher where there are significant difference in technology and tactics as well.
3. About simulations, they are fine but they miss the 'human factor'.
2. GW is not a good analogy since there was a disparity in the Ooda loop of the two forces. Here we are assuming equal ooda loops, equal SA and training. That is the whole idea of a wargame to remove the human factor and let the roll of the dice play.
3. Hence wargames and simulation.