Are the images numbered? If they are - that is, if they are, for e.g. image00001.tiff, image00002.tiff and so on, you could theorietically import them as a folder, then dump the folder on the timeline and they would all appear in order. Theoretically.
In practice, 10,000 images sounds like a lot to get going all at once. I would import them in blocks - so - maybe in weeks at a time or something?
Are they still images?
Also, are they prepped for FCP? Or are they too big/too small/wrong format/CMYK etc?