Jeep has an interesting challenge but also a great opportunity. It has probably the best product line ever, a captive market, competitors like GM have their own problems, and there is a very clear support from its parent company.
I think capacity is only a short term problem. With the Renegade to be produced in Italy and a new Cherokee plant in China, things should get better in a year or two. With Jeep viewed as one of FCA premium brands, I have to believe that a new plant will be added or repurposed in US or Canada as well. Short term it is frustrating for buyers as I can attest, waiting for my Cherokee.
The bigger challenge Imo will be positioning and brand image. Jeep has this in spades but it is very different across the globe. Hence a Jeep that sells for 25 k in the US, to the offroad enthusiasts, commands 50 k in Europe and sells to a very different market segment. At some point, this may not be sustainable. I have heard suggestions that Jeep should follow Land Rover and split Into an offroad division and a luxury offroad division I.e. Land Rover/Range Rover but am unsure if that would solve the issue.
And, to answer the original question, I do think that they will come very close to 1 M sales this year.