I don't know. There was a time when I would have been completely opposed to a Batman death. I mean, out of all comic universes, the Batuniverse is definitely my personal favorite. But, I feel that the Batstory should have a fitting conclusion -- that Batman should eventually die. That being said, the story needs to be epic, tremendous, and memorable, and should tie everything up nicely. I'm not saying the Morrison arc is how it should be done (or even i it is being done) -- I actually have no opinion on that as of now because I haven't picked it up yet. Just saying that most stories have an ending, and I'd like Batman to have one too.
Also. While I can see why a possible death for Batman could kick up some controversy, I'm not entirely sure why it has received the level of anger with which it has been met. Comic continuity is twisted anyway, if you don't like a particular arc, why not just ignore it? With me, if I see a story that I don't think fits my personal vision of the Batuniverse, I just forget about it (Jason Todd's resurrection for example). Granted, it may be difficult because it can continually resurface in various references throughout the ongoing series, but in my personal experience, I just tolerate it.
But whatever, I can still see why people are against it -- just my two cents.