I have a well working and exhaustively tested set of toolbox functions with some hundreds of thousand code lines (plus blank lines and comments). Switching to Julia would require years of development and testing. In addition, the Matlab code is not only tested with the current version, but it has proved to be compatible with many different versions. Some core parts worked under R5.3 already :-)
I like Julia, but I will not use it for productive purposes. "Productive" means e.g. the decision about surgical operations on children. Having a bug in the code or the interpreter is no excuse, when it caused a wrong decision about a treatment.
The support for Matlab is very useful and valuable: MathWorks is very professional and the forum helps also. I did not test the support of Julia for serious problems.