[database design] the "too many" number of users of one instance!!

Good morning everyone!!
I have a question about the number of users of one db
instance, "possible problems" caused by too many users,
and "pros and cons" of this case.
Now, the company I work for is considering centralizing
150 db servers of 150 sites. 150 chained-stores have
their own db instance.
Here is the structure of db instance after the
centralization.
1. Centralized instance has each user per site(150
sites), for example, site001, site002, …site00n, …
site150
2. Each user has its own 250 tables, thus the db
instance become to have 150 users and 150*250 tables.
3. Each user has almost the same table schema, not
exactly. There are a little bit of differences among
the business rules of each sites.
4. the version of centralized db instance is "oracle9i".
Theoretically, it seems like there is no problem, but I
have not experienced the db instance like this, which
has "too many" users of 150 users.
In terms of every aspect such as "performance/tuning",
"system management", or "something else", I would like
to hear what could be "the pros and cons" of this
structure.
Assuming that there are possible critical problems caused
by too many users, what could be the alternative choice?
I will be waiting to hear your experience. Every response
will be appreciated, even if it is not about what I asked.
Thanks for your interest in advance.
Have a nice day.
Ho from Japan

Have a look to following AskTom threads:
http://asktom.oracle.com/pls/ask/f?p=4950:8:4685256847630125933::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:31263903816550
http://asktom.oracle.com/pls/ask/f?p=4950:8:4685256847630125933::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:63447102315094

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