Nope.
The Falklands is heavily defended by infantry and an antiaircraft battery. There is also ample air and sea defences, both in the area and that which can be sent to the area if necessary.
I utterly oppose the Harrier decision, but the Falklands falling?. No.
We can still defend our territory AND fight as a major military power.
There is also an operating airfield there, something that was missing during the Falklands War.