Free To Canoe
Thinks s/he gets paid by the post
You very definitely need to have a will done. Otherwise the state will decide how assets are distributed and depending on family structures that can get very complicated.
Understand clearly that it is not certain that your wife will by default get everything. In some states she would only get half or perhaps less, the remainder being distributed to other relatives, some related only by marriage.
A will resolves all those issues simply and (relatively) cheaply. Since a will is for most people a "one time" expense I'm in the school that says pay a lawyer for it rather than risk screwing it up myself.
As for us DW is very much "in the loop" on finances (she wrote the spreadsheet we use for income/expenses on an almost daily basis) so she would have little difficulty taking over.
Reading Midpack's link and above got me thinking. In Pennsylvania, even though we don't have any kids, part of the estate goes to surviving mother in-law if DW kicks the bucket 1st. I am surprised to learn this. I am starting to appreciate that the $500 for will and other documents was money well spent.