Trying to think positive. Look at how Byram turned things around in Buffalo. He was fading in Colorado with the exact same concerns as Chytil: one hit away from being retired. Now he's firmly established himself as a top four and is having a solid season. Yes, the health risk is still there, but who knows how things will turn out.
There’s also players like Crosby and Bergeron who were considered one hit away in their mid20s and ended up playing until their late 30s at a high level.