The good news is that all parts cleaned up good as new--with the exception of the bearings on the output shaft (about $40 for both bearings--tapered ball bearings).
We think those bearings were compromised by their inability to receive oil, thanks to the green goo clogging up everything.
The bad news is that you are looking at parts that still had goo on them, even though the transmission fluid had been changed more than 20,000 miles before these pictures were taken. In short, even though you might change the fluid, if the goo is there, it's going to stay there until you crack the trans and clean everything up.
The gunk was at its heaviest at the rear of the trans, but was also thick on the front differential.
Best guess is that problems will manifest themselves first in the output shaft bearings (disconcerting noises and vibration). You'll have a chance to clean everything when you crack the trans to take care of those bearings. On the other hand . . .