Comment Re:Unforeseen consequences (Score 1) 64
You already can (almost) have an Excel file in an Excel cell. OLE Spreadsheet objects can be inserted into a a spreadsheet.
It seems the "Insert Object" command does not list Excel worksheet when invoked from Excel itself, but such an object an be created in Word and cut/pasted into Excel.
The whole point of the spreadsheet itself is that it is a set of visible arrays; the feature just lets people bury the whole visible calculation aspect of spreadsheets. Yuck.