I do a lot of astrophotography as a hobby and for visual/infrared images, these satellites are a non-issue and extremely easy to deal with by simple outlier rejection techinques. One of the most basic techniques is sigma clipping, in which you stack a bunch of sky-tracked images, and for each pixel, you throw away data points that are more than a sigma or two away from the mean before actually averaging.

I already have to do this for aircraft, and aircraft do a LOT more photobombing than satellites.

The satellite trail images people post all over the internet to fear monger the public are actually processed exactly the OPPOSITE way that astrophotographers would process an image stack. They are processed by taking the max at each pixel stack to emphasizing the outliers in the stack instead of eliminating the outliers and averaging the rest. No astronomer would ever do that.

I can imagine they might be a bigger threat to radio astronomy, though.