TL;DR: Customers are interested in Sage 100c at the point you mention that there is no difference in cost up through 9/30.
They become very cautious the instant you mention that the price could change on their next renewal and at that point I am not sure how much time we should reasonably be expected to spend explaining and making computations for them on what that change could be because there is $ 0.00 revenue available to us to make those computations.
In most of my cases, I expect the customer will go ""no decision"" unless I spend time working up the comparative $$ of 100 vs 100c.
I'm helping to develop a FAQ so some of the questions can be easily answered.
Unfortunately, I think the ""last mile"" of that final decision is going to be difficult unless Sage gives better comparative reports showing 100 vs 100c (SLP) so the customer knows the true Y2 cost.
As of now Sage does not seem to know what the year 2 cost will be --- whether they will continue the credit or if they will push the customer up to 100c SLP in Y2+.