i would buy it immediately. and no, i wouldnt worry about an upgrade when the blu-ray comes around (if it does). but if that were availible, i might buy it as well. the main problems with VHS are its lack of quality and lasting ability. and the problem with laser disc is you have to flip them, and they're huge. it would seem that DVD and CD formats will still be around for awhile even when newer formats come out.
but yeah, there will always be an outcry as long as Lucas keeps being a selfish idiot, in whatever way he decides to do that.