Blu-ray apparently isn't coming to Macs
news.cnet.com
news.cnet.com
I think it comes down to the player cost, which would move the mac mini out of the range their comfortable with. Wouldn't surprise me at all if they do an about face and market a blu ray player as a great feature in a future product iteration.
1. At very least they are still going to be strong through at least one more product cycle.
2. For people not on the cutting edge of technology they are going to be relevant for some time, unless they decide just to stick with DVD's for the next 5 years.
The only viable long term usage for blu-ray would be backups. One blu-ray disk is roughly equivalent to 5 dvds in terms of storage. Unfortunately, in the coming years, blu-ray will become too small to be viable for backups, the same way dvds have become.