Seriously this thread has got to be the most comical on PPRune, its embarrassing the amount of dreamers spouting tosh about "what would work" I am sure the airlines have done their maths and checked the demand and possible yields before basing aircraft.
There are many larger airports with bigger catchment areas who would love flights to the Caribbean, Middle / Far East and other EU cities that don't have them that would be well ahead of Newcastle in the pecking order......