You answered your own question.  You wouldn't buy a Coupe and that kills resale.  I wouldn't buy one after it was discontinued for fear of resale.  I have owned a coupe and think they are good for the right application.  I liked mine at the time. 

Most producers are switching to and prefer the self-propelled sprayers.  That very well may not be true for your area, I don't know since you don't have your location posted.

John Deere is adding a product to address the very market that AGCO thinks is failing.  I have noticed a lot of 4630's in my area including the new one I bought this past year.  The dealer lots have now been populated with several new ones for sale.  They are selling because there is still a market for them.  BTW, the Spray Coupe dealer at Brownfield, TX (my regional area) is reported to be the largest volume Coupe dealer in the world.