I'm guessing your SE installation is poorly managed/set up and not an issue as to whether or not Solid Edge is up to the task.
Dan Staples or others with greater knowledge can speak to this more, but I'm guessing 2,000 seats of SE is a viable route.
Sounds like your company needs to get your local reseller [VAR] to come to your site, in order to evaluate the issues & frustrations, to then provide a solution to reduce these.
There are so many variables that can inhibit productivity, that there is no one answer to suit all applications in a business, based solely on number of seats......the entire sub-system needs to be geared to make that work.
Not that I'm discounting asking other large site users/admins on this forum, as their experience and input is invaluable....just saying, this is why you pay maintenance, to get exactly this sort of guidance & support.
Design Manager Streetscape Limited
Solid Edge ST9 [MP5] Classic [x2 seats]
It is not the CAD system which limits the size and/or the complexity of the installation - at least in Solid Edge's case.
It is always the system management infrastructure which causes angst. In my experience it is the lack of rational standards or the lack of application of those standards which cause issues.
The first step in rectifying these problems is to recognise that there is a problem and to bring in qualified consultants to work through a solution.The issues must be owned at the highest levels within the organisation.
Then and only then you can look at a PLM/PDM structure to control and maintain procedures and standards. The world standard in my opinion being Teamcenter which works well with Solid Edge.
We have 18 users and are just about managing without any PLM/PDM system.
This creates problems because everyone seems to have their own idea of how to do things.
As Mark says, the biggest problem ( and that applies to any cad system) is managing the data.
You can create a whole lot of garbage very quickly if you don't get it right.
We have a very complex multi-site network with SE available on thousands of PCs. I regularly see 100-200 simultaneous users and we have no problems at all with volume.
All these users (students) are working on their own projects so there's no real product management issues however, thank goodness.