Upgrading to Power BI Premium per user

Looking for help with the process to upgrade  from the shared service to PPU. 

I have a workspace with a database currently in it. I have published this database so others can pull it into their workspaces to create reports. This gives me a single centralized database that I can maintain and pushout changes to the other workspaces. 

Im finding out that the main workspace has a limit of around 320 megs before the database will no longer refresh due to memory allocation limit. Im told the fixe to this is to upgrade to Premium per user. 

Now in looking at this closer Im realizing that if I upgrade my main workspace to PPU then anyone that wants to use this db in that workspace has to have a BI user license for PPU. no problem here. 

My issue is this db is used in several other workspaces. If I upgrade the main workspace do all the others that are using this db  have  to be upgraded as well. If that is the case will the single license allow users to get into all of these upgraded workspaces. Thanks for the insight on how this works.