1. broader customization (the current MacOS is quite possibly the most configurable OS out there - you can work the way you want)
Customization will come. In fact, with the ability to change some values in the defaults of misc. applications, there is already some customization, Desktop as well as the Dock are included in the list of apps that are customizable.
2. the Unix like filesystem ( A mac user says, "WTF is USR?")
Correct me if I am wrong, but I recall the USR directory to be hidden by default. If these users are so fragile as to be afraid or put off by OS X, do you think they would actually take the time to go to the Terminal and set the correct property to show all files? I don't think so. I think Apple is doing what it needs to make the novice feel at home while giving the power user the ability to do what he/she wants. I think it is coming together nicely.
3. the absolute requirement to have multiple users (How about an option to install only a superuser account)
Well, you really would not want to have a superuser account only (ie. root) however you can set up OS X to automatically log you in as the user you defined while going through the setup. Is that not good enough? I mean it would act just like OS 9 withouth Multiple Users activated. Sounds pretty Mac-like to me.
4. the whole tar / gzip / sit / bin / hqx thing. (one or two file compression schems is okay, but this is crazy.)
For the mainstream commercial applications, and shareware for the most part, you will see Installer Packages. Stuffit (not necessarily the best choice) will handle unstuffing most all things you might need to unstuff. For power users, again, ones who want to port apps, or want to share some code, etc. I am sure will still use form of tar/gzip. I say the more options the better.
5. things like the clock are not apps to most mac users and launching them / quitting them is strange
I agree with this statement. I think Apple with incorporate these items into the OS by release. If not, there will be clock apps, etc. that will be applications, hidden from the dock, and set to auto start upon login. Effectively giving the appearance of being part of the OS. In fact, I believe you can do this already with some 3rd party apps.
6. having file suffixes that the user doesn't usually see is not mac like at all. (.app, etc.)
Well, the .app suffix is hidden from the user by default if I remember correctly. I believe you will have a global options to hide all extensions. While this is a good thing, I do think there is a need for file extensions. Especially when you find yourself in mixed environments. Not to mention, you use .jpg, .tif(f), .gif, ,.mp3, .mov, etc. already and people have not moaned and groaned about that too much... So if you can hide all the extensions eventualy, and the .app is hidden already, why are people still complaining.
Okay, sorry about this post, but I just wanted to give some of my views on OS X. Yes, it is missing functionality here and there. I might also be a bit disappointed if those missing pieces were not there by final, which I hope is still released in the 1st quarter of 2001. Apple needs to get this OS out. Regardless if mainstream developers are ready. They need to get Carbon solid and set in stone so developers can finish porting...
And as far as people feeling the the current Mac users may be hesitatant to migrate, I think you will find that OS X brings a whole new base of users that are just as, if not more so, fanatics about their OS. The power of X will bring new vocal users about its capabilites, and it may also leave some intimidated Mac users behind. In the end, I think the customer base of X will far exceed the base of OS 9 (or any previous version).