How long will you live your life worrying about being layed off by IBM. Surely the associated stress and anxiety will consume you. How about taking control of your own destiny and plan your life/career instead of IBM doing it for you? Do you believe IBM cares as much about you as you yourself?
You have to weigh your current situation against what the future holds. Maybe you can afford to play the lottery, to wait for the axe to fall and deal with the ensuing consequences. If not, then don’t be complacent. Take matters into your own hands - while you still have the cushion of a salary.
And here you have the truth, folks. Perfectly laid out by @2kje+18VtAMS3. Job security at IBM is a thing of the past. If you can't deal with the stress, now's the time to leave. It'll not get better.