It takes time to get things going. Adobe, and I believe Java, only recently came out with 64bit support. Think of it this way: for years you had 32 bit, and most applications became 32bit; 32bit worked. It appears that 64bit usually requires more space to be installed as well, and it usually isn't any faster unless you get more than 4GB of RAM. Can get expensive.
It is all still in the process. many companies don't see the need to support 64bit as 32bit is still supported and works well.