I buy consoles for their exclusive games, the ones they have or the ones that i know they will get, and as HUGE souls fan, Bloodborne is right now the Biggest and ONLY reason for me to have a PS4, i know more games will come out this year and next year that will justify my purchase of a PS4 even more, BUT regardless of that BLOODBORNE is the biggest reason for me to OWN a PS4, and not even the other games coming out later (like MGS V, Persona 5 or Uncharted 4) come even close to being as much of a reason to buy a PS4 like Bloodborne.
Exclusives give VALUE to consoles, if Bloodborne becomes Multiplat then i would feel like i WASTED the 500 dollars that i spent on my PS4 becuase i could have used that money to just upgrade my PC and play the best version of Bloodborne that would be the PC version, its ture that "ease of use" is another reason to buy a console instead of a PC, BUT for me its not a good reason enough on its own to buy a Console.
And if we go by your logic and make every game available in every system and eliminate exclusives just so everyone can enjoy them, then i would have TRULY just WASTED 500 dollars on my PS4... money that i could have spent improving my PC to play the Best versions of those games...
So to answer your question:
NO, Bloodborne going multiplat WOULD NOT stop me from enjoying the game just as much as i am enjoying it right now that it is an exclusive, (just like Deus Ex, Skyrim, Battlefield and GTA being multiplats didnt stop me from enjoying them as much as i did), BUT it would HOWEVER DESTROY the MAIN REASON why i bought a PS4, and those 500 dollars that i spent on it would look like a WASTE to me.
