But this isn't what Loren wrote.So Loren was quiet logical in his conclusion that no experimenting on animals means no new drugs unless we replace the experimentation on animals with experimentation on humans.
Even if Loren had included the italicised section above, his conclusion would still not have followed logically - human experimentation is not the only alternative to animal experimentation.
Edited to add:
For Loren's statement ("No animal experimentation = no new drugs.") to make sense he would have to show that all alternatives to animal testing would be unacceptable/unworkable.
I didn't include it because it was sufficiently obvious I didn't feel I needed to. Note that everybody else understood my argument.
As for alternatives--you haven't listed any. Animal testing is expensive, they don't do it until it's already passed lesser testing.