Over at a Thomas Goodwin blog (hosted by someone who enjoys the writings of the historical Thomas Goodwin - and a blog that I enjoy reading and could generally recommend) there is a new post that compares Goodwin and Turretin on the issue of what would have happened to Adam had he continued in righteousness. It is an interesting hypothetical question. Being such an open fan of Turretin, I would not want to suggest to anyone that they should take my word that Turretin makes the stronger case.
On the other hand, the main point that Goodwin makes (as I understand it), namely that no promise of confirmation in righteousness after a time of righteous obedience is promised in Scripture, makes some intuitive sense and provides the reader who is interested in the topic with a reason to peruse in more detail the arguments presented by each side.
I would respectfully submit that in limiting one's research of Turretin on the issue to Topic 8, Question 6 (as it appears the TG blog has), one may miss some of the other things Turretin said on the issue, particularly in the third topic of the first part of Turretin's Institutes (around question 13).
Here's a link to the Thomas Goodwin blog's article (link).