I'm not at your threshold in terms of salary, but I'll answer for my company.
I work for an insurance carrier. Insurance, as an industry, is very risk adverse and doesn't want any part of any lawsuits, so it is virtually impossible to be fired. (The one person I know of that was actually fired assaulted a coworker.)
However, it is possible to be managed out. I'll use the example of an old boss of mine. Things were going great, got promoted into a fancy VP job, and then there was a reorganization. Now, instead of being a VP of the stuff he liked, he was a VP of stuff he didn't like. So he majorly slacked off (getting in at 10, hours on lunch, leaving at 4, refusing meetings, etc). That went on for over a year before another reorg meant his job went away completely.
He was offered a non-VP job, but refused it as beneath him, and so he ended up at a not-as-prestigious company because they'd give him a VP title. I sometimes wonder if he changed his work habits there.
For the record, there's no specialized skill or degree required for insurance. The VP above never went to college, started in the mailroom at 19 and worked his way up. I have a business degree, but I work with a lot of people with liberal arts degrees or no degree.
There are some roles in my company that are being outsourced to India, but that hasn't caused any layoffs that I know of; more that they're not replacing retirees and those that remain have part of their job as supervising the outsourced work.
Similarly, there's no concerns about younger, less experienced people taking over jobs. I am one of those people, relatively speaking; I'm early-30s, and 20-30 years younger than anyone with my title in my group. I almost certainly get paid less in salary, but I'm a high performer, so I get a larger chunk of the bonuses.