Guy,
You aren't alone. Due to the publicity for my new book, "Spend 'til the End," I've talked with reporters and columnists from a bunch of newspapers around the country in the last few weeks. They were all concerned with how long their jobs might last. And there seemed to be a universal staff cut of 20 percent. Very tough on the tummy.
The real measure of your personal security isn't having all your debt paid off. The real measure is your "staying power"--- how long you can sustain your current standard of living without earned income.
That means figuring out what your core expenses are and dividing that number into your accessible assets. Suppose, for instance, that your core expenses (including mortgage but excluding taxes which you won't have to pay if you aren't earning) are about $6,000 a month. Then if you had $60,000 in a money market account you'd have 10 months of "cushion." But it you took that same $60,000 and paid off the mortgage, your core expenses would be lower, but you'd still be in a desperate condition without the cushion money.
Since you're 51 and your wife is 47, once your money goes into the 401(k) plan it can't come out without paying a penalty until you turn 59 1/2. That's a big disincentive to doing anything more than capturing the match. Unfortunately, paying off the mortgage also means the equity isn't accessable any more except as a home equity credit line.
I suggest that you save enough to capture the match, then build your accessible savings. At the same time, secure a home equity credit line--- but don't borrow against it. How much you should have will require a long discussion with your wife because you'll need to agree on the trade-off between the lost tax-deduction of the 401(k) contributions and the increased "cushion" you want to build.
If you are thinking of going independent when, and if, you lose your job let me tell you the biggest mistake that most employees make--- underestimating the amount of time and money that it will require to get your cash "pipeline" filled with money due rather than money out. Even very successful freelancers often need enough cash to cover at least 3 months of receivables. Start dealing with this--- and thinking like this--- now and the transition may be a lot easier than you think.
Scott