might actually just be a better idea to wait and see what will actually happen with the fork ?
The decision to wait (for whatever reason) or not can only be evaluated at the end.. It might be a great decision now to wait with buying Bitcoins yet, as the value might be -50$ in a week for example. But, the value might also increase. Whether or not you should invest now (or wait), is a bit like gambling I think. (Although some knowledge is usefull).