Tuncer, regular "hard-core" ports are indeed a goner.
Dual booting solutions are essentially ready;if I have managed to understand only a tenth of the technical intricacies we will see viable and usable solutions within the month.
So,non-casual and non-sims games will not be bought in numbers any more.
Very few people will buy a 6 month old Mac port that runs slower than the Windows version any more.
Results could be disastrous: Mac devs leaving the platform, consumers buying fewer or no Mac-apps and Apple paying less attention to their APIs.
Edit: Then again,it will probably "only" affect the gaming market and the potential porting of commercial apps like AutoCad.