Hertz is already doing pretty bad. Uber and Lyft are a huge problem for the rental car companies. And Hertz in particular has accounting irregularities. They're going to have to redo the last 5 years of their financials.
Their only saving grace is that car rental has become an oligopoly. The Obama Administration allowed Avis to merge with Budget and Hertz to merge with Dollar/Thrifty. Avis also bought Zipcar. The other company in the 3-way oligopoly is Enterprise/National. Car rental pricing has been artificially high with less competition.
Uber and Lyft, and the entrance of some smaller competitors (because the car rental business has low barriers to entry -- really, how hard is it to rent cars?) are starting to bring rates down again.
Rather than simply boycotting Hertz, I suggest using a service like Hotwire. Wait until the day before you need to rent a car and then go to Hotwire. Rental companies can either rent you one of their cars for cheap or leave it sitting on their lot earning them nothing. If there are no good deals (because of high demand or because the local city has a high tax on car rentals) just use Uber or Lyft.
If your company has an exclusive deal with Avis or Hertz for business travelers, your company is overpaying, probably by a very large amount. Do some price comparisons with Hotwire and email them to the decision makers. That would be the worst thing for Hertz.