The limit is a practical one. If you create an information map with hundreds or thousands of data items, then the performance is going to be poor. In addition, information maps are intended to provide an easy interface to a specific subset of data to non-technical end users. So, typically, you would not simply create information maps that include all columns from a data source. For instance, a report creator will likely have a difficult time trying to navigate through 2000 data items to find just those data items that are useful for one report, even if the data items are in separate folders. Instead, you should create multiple information maps, each containing a selected number of columns that serve a particular reporting need.
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