That would require a couple of things ...Sheriffs/police chiefs - and by extensions their communities - have to be willing to spend more on training. Officers absolutely cannot be proficient at dynamic entry, gunfighting, and hostage/victim rescue without proper (valid, current tactics taught be SMEs), frequent training and practice. If they want their patrol officers to aggress and stop an active shooter such as in a school, they absolutely have to do more. Good training costs time and money.
With low staffing, training time is more precious than ever. Regulatory agencies like POST need to eliminate mandatory training that isn’t there to win fights and solve crimes. Pretty much if it doesn’t require a safety briefing and a first aid kit on site, then it isn’t worth cutting a chunk of time out for.
First, that AO training no longer include burning up limited training hours addressing whatever hot button issues come along that some legislators think needs to be taught to cops.
Second, that you have the best people available to not only excel at the advanced training, but have the initiative, will power and mindset to put themselves in Harm's Way to protect the innocent victims at soft target sites, and not just huddle up and wait for help, themselves.
Both are probably going to prove to be difficult to achieve in today's societal and political climate. More's the pity.
Then again, I'm only on my second cup of coffee and am still in pessimist-mode.