Safety grills over engine intakes. Just like on electric fans. They'll demand it.
The critical outstanding story for the industry is whether the rampers were under pressure to turn around this plane in minimum time and started cutting corners with safety procedures.
Here’s a detailed analysis of what happened from an actual airline pilot. There were several factors that lead to the aircraft running the engines while parked at the ramp rather than shutting down immediately and going to ground power or APU.
https://youtu.be/2QGi9RIIF-E