Only two people left last year. There are a lot of considerations that go into the decision, and most people (and by definition most of our law review) decide against it.
Some reasons why people don't transfer:
1. Your grades don't transfer with you. You get "pass" credit, and your GPA starts at 0.00. That can work out really well, or really badly. 2L year with recruiting and journal work is very busy, and a number of people have their grades decline. This isn't a big problem for them because 30 hours at top 10% won't change much. However, you won't have that buffer.
2. Availability of journals - Judges I talked to about clerking felt that being on a law review was important, and so if that is important to you, you need to see what their transfer policies are. I know Texas invited their transfers onto their International Law journal (they didn't tell us this after being accepted for transfer - I don't know if they do this routinely).
If you stay at UH, and have top grades and LR, you will do fine in the Houston market. People also get jobs out of state, but this doesn't happen often because most UH folks are planning to stay here. I suggest you talk to your tutors about whether they considered it, or other members of the law review. Talk to faculty about it also. You will need a strong letter of recommendation to successfully transfer, and you should line that up before everyone leaves for summer.