Well things like chytridomycosis and viral disease should be of concern to even those that do not care about amphibians as it could have major impacts on humans (i.e commerical fisheries, livestock, agriculture, etc.).
The operative word in your post is "could".
A meteor "could" strike the Earth next week and eradicate all life.
You or I "could" get hit by a Mack truck while we're crossing the street.
While traveling at 70 mph, my car "could" have a blowout in the left front tire, thereby sending me across the median, meeting you head-on and killing us both.
"If" is said to be the biggest word in the dictionary. For tree- and bunny-huggers, I think the biggest word is "could".
But, um, doesn't this mean you would WANT to make the fungus extinct? But why? Doesn't fungus have a right to exist?
One thing that never sat well with me and the enviromentalists... They couldn't rationalize the food chain.
If and when it is shown that a particular pathogen has switched hosts, yes; but as a precautionary project to eliminate a whole strain when the prospects for success can't even be assessed, it makes for foolish policy.