I guess my opinion lies somewhere in the middle of "don't risk it" and "life's too short to not take risks". I made the decision 7 1/2 years ago to move my family from Illinois to Oklahoma for cheer. We have not looked back and have not regretted it for one second. However, my girls were 7 and 9, not going into their senior year of high school.
I think the only person that can really answer your question for you, is you. If you are THAT passionate about having the opportunity to cheer on a higher level team before you age out...then it might be a great idea for you. I do believe in the "you'll never know until you try" philosophy as long as you understand the pros and cons of the decision. What's the worst that can happen? You don't make the team you hoped for and decide to stay at home? Not the end of the world. What's the best that can happen? You make a team that will push you to be your best and have a great lasting memory of your senior year in high school.
What you need to make sure of is that you aren't putting this idea into a fantasy world dream. If you do decide to move for the year...there WILL be things that make you angry, frustrated, sad, disappointed, etc. etc. You can't expect it to be all butterflies and rainbows. But if you know that going in, then there's no harm in going for it!! It's one year...and at the end of the day if you give it a try and you don't like it...home is only 3 hours away. :)