Personally??? you need both New Amiga only games and ports its that simple!
Unique games so that peopel go wow thats good and I cant get it anywhere else.. and ports so that you dont have to have more than 1 computer to play all the games you want and already like!
I brought a PC for the SOLE purpose to play CM2/3 (I brought Cm 97/98 on the amiga and omg did it suck cheesy boils, it would crash after 2 seasons!) and when I saw a mate playing Half-Life I just had to have it!
Im a game freak sometimes i only like 1 game on a console (like Die Hard Arcade on the Sega, or Halo on the Xbox) but if that console/computer had lots of games I like already and like the look off im going to buy it!
Closing off the Amiga from game ports will only send it down the path the Xbox is currently facing.. thats a good example, amazing machine. amazing hardware, 1 or 2 amazing games but not enough to stop people from buying the Playstation.
IF M$ cant get more than 20 or so games out on release where does that leave a smaller company??
Games and apps make a machine, and so does choice! people wont take the Amiga seriously if you dont have the Adobe range of programs for example or Quark, but that still doesnt mean you cant have Amiga specific apps as well!
just my 2p worth anyway! :-D