of course they wouldn't have, but if they don't change their policies at all, they have 2 new problems: some patrons will perceive your property as not taking security seriously if other hotels have "beefed up security" while yours doesn't. Secondly, if there were another shooting, even if it wasn't nearly as big as the Route 91 massacre, in court they could point to your lack of doing anything whatsoever "in the face of the nations worst shooting".
not really, no. I'm sure they considered everything, like having airport-style security to go up to the rooms, which is even more invasive. This way if there is another incident they can point to their policy and say "see? we inspect every room every 24 hours. We can't have a security guard in every room, but we at least tried"