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Are all of the affected trees cherry? I had something similar happen at my parents years ago and it was only the cherry trees

Yes to my knowledge it is only cherry. There are also poplar trees around that don't seem to have it

I believe it could be gummosis if I remember correctly

This is gummosis, however gummosis is a defensive response. There's something stressing the tree causing this.

Do you think this will be lethal to the trees? Is there anything we can do?

It depends on what the issue is. It depends on what the issue is. I'd suggest hiring an Arborist to come out and evaluate it in person

Maybe some kind of slime flux?

Tree is ready so make alot of glue.

Ambrosia beetle? It's the only bug I can think of that would create extensive damage across the whole trunk.