ExDubai,
With over 700 Globals delivered and 199 business jets delivered in '15 vs. 154 at Gulfstream, not sure they gave up on that market. The G7000 is delayed for a large part due to the C-Series delays--only some much engineering talent, money and time.
Phoenix,
Airlines use hubs because it is cheaper, not because it is convenient. For your scenario to work, airlines will have to get premium fares for those non-stop sectors over sending the pax thru hubs where larger, more efficient planes can be used. How many far north cities can generate 200+ pax a day to the Caribbean island.
GF