So, I've slowly been growing a great team with my web design firm. I do pretty much all of the backend development, with some frontend, got a great artist and great content/data entry people. Stuff that I can't do, or we can get to, I've been doing through contractors.

Well, work is getting to the point I'm ready to hire a frontend developer, and have been talking to 3 different qualified applicants. The problem I am having is that these people all have several of their own project running, and have mostly been working on their own for several years. Am I making a mistake hiring them? Will they be around still in 3 months? Any advice out there?