Re: The Doctor (why didn't they just make more?)
Well first the EMH was too complicated to copy... then they gained the ability to make a backup module with a fully working version of the program... then immediately lost it, and the ability to make another one as it was again impossible to copy the EMH when he teleported to Jupiter station to treat Zimmerman. So... yeah.
"I was never a Star Trek fan." J.J. Abrams