I don't know if you're serious or not, but FABs doesn't "lock you" into anything.
If you purchase the one-year you'll get whatever updates may occur for one year, but it's my understanding that the software continues to work, sans any improvements, even after that year is over. I'm sure
@fabs can refute me if I'm wrong.
The 3-year option only extends the length of time you will get updates, and for a slightly reduced price per year.
But no matter what, I believe you have a functioning tool "as functioning at the point of its last update" for as long as you want to use it in that state.