Example: The past work history of Alex may be a circumstance that affects the risk of termination but would not sensibly surmount the countless ways in which he could cease employment in the course of one year let alone an assessment of each of four years.
1. In the above sentence, can I change "would not" to "will not"? If I can, any difference in meaning? what is more grammatically right and why?
2. What is the function of let alone there?