Having deduced the inevitability of the trip he sees no reason to delay
Having at this point realized 2 things although been thinking about it for some time. 1 - he is becomming unable to keep track of time well enough to ensure he is stocked with booze. No need to do that in Vegas. 2 - related to 1, which is the fact vegas is 24x7 and he can always get booze when he needs it. Another reason of course is his money must last him until his death, and it won't in LA.
