i am a submitter at alamy, and i think it is a good plan. They will be accepting jpg images then, so it won't take THAT long to submit. I know i have lots of images sitting on my hard drive for months because it is hard to get around to sending a disk, and also i feel like i need a certain number of images before it is worth the bother.
I have been looking forward to the ftp'ing for a long time.