The big companies like John Deere, Case/NH, Agco (massey ferguson) etc. are all experiencing boom times right now. Large ag equipment sales are up quite a bit due to the high food prices. These guys will prosper in current times. Kubota will survive because they're a well established high quality brand with large market share even though they don't have any large ag equipment sales. They'll take a hit in profits but their mass will let them weather the storm.
The ones that will be hurt, as the above poster said, are the smaller companies focused on the CUT segment. The compact utilities are generally homeowner products and being fairly expensive they'll be the first discretionary purchases to be put off. Likely a lot of guys will sell their small tractors to get out from under the payments, driving down prices on the used market. For most people their small tractors are wants not needs. I'd expect the kiotis, mahindras (U.S. market at least), montana, branson/century, etc. to fare poorly.
The guys on this forum who have been around farm country all their lives have pretty much consistently given the advice that those looking to purchase a new tractor should look for first tier, established companies in order to ensure that parts and service will be available in the future. Leave the "up and coming" companies to someone else to roll the dice on. Many of these companies make nice tractors but that's not enough. A tractor is generally a long term purchase, much longer term than an automobile, and I want to be assured that I can get parts in the future to keep mine running. I can easily get any part needed for a 40 year old MF135, but will you be able to get parts for that kioti DK35 in 40 years? Doubtful in my mind. The upcoming trying economic times will most likely weed out a lot of the second tier players in the small tractor market. It'll become apparent why the advice to stay with well established makers is sound advice.