It would depend on how many in the concert crowd had rifles instead of pistols. Pistol rounds would have fallen somewhere short of the hotel and rained into the streets.
If all of the people in the concert crowd had rifles, on the other hand,...there would be 22,000 people firing rifle rounds in the general direction of the hotel and surrounding area.
Please don’t encourage
Aiming at a person is way different than shooting loads of bullets into a densely packed crowd. Reflexively shooting with a rifle isn’t as easy to shoot accurately as some think that it is. The real immediate issue with gun control is home defense. If someone is breaking into your house, you have far less time to personally fight back against the intruder than it takes for the cops to get to your home.
say what? bringing in rifles to a concert? I see about zero chance of that happening.