i'm sorry to hear that you're having a bad experience. i suspect that most responses will support sticking it out and staying with your plan. if you already know that you want to work in land development, then good, stick with it. there's two important factors to consider however. (1) you have many options. in fact, it is unlikely that you will ever have another moment in your life when you will have as many options as you do right now. picture your life as an hour glass.  entering your senior year, you are entering into the neck of the hour glass. (2) know that, statistically speaking, the first job you take after graduation will likely determine what you will do for the rest of your career. choose carefully.

this slowdown is everywhere and all across the industry. it's not just in land development and it's not just in your area. these slowdowns happen. they happen in all industries and there is no way to truly know how often they will come or how long they will last. this is unfortunate timing for you but switching specialties won't protect you in the long run.

options:
(1) switch sectors. you can do land development for a consultant, a public agency, or a private developer. economic slowdowns affect each sector differently. when one is slow, another may still have work.
(2) wait it out and stay in school. you can keep going and get a masters or another bachelors degree. in land development, you may find it useful to have a law degree, an urban planning degree, or perhaps an MBA. having this broader skill set will also help protect you in future slowdowns.
(3) wait it out and join the Peace Corp (or some other such organization). this was an option i seriously considered during my senior year and have always regretted not doing. from beginning to end, it's about a 2.5 to 3 year commitment.
(4) relocate. the slowdown is everywhere but it is not as bad on the west coast and some areas of the gulf coast.
(5) relocate internationally. the economic slowdown is mostly domestic. a lot of international markets are actually growing quite well and are more stable than in the past.
(6) the USACE would take you in a heartbeat. i personally can't recommend joining the military. that is a deeply personal decision for you alone and not to be taken lightly. but the Army Corp is also an option in which you can ply your skills and not worry about the state of the industry.

good luck. and try to enjoy your senior year. it goes by really fast.

Great post Mark!  Having served in the military for 8 years I can say the Corps and the Air Force are still in need of Civil Engineers and you don't have wear a uniform to help them out![ If you want to learn more send me a note at samecollegeoutreach@gmail.com.