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To echo other respondents, thanks for asking the question and allowing us all our 'two-penneth' worth. You can tell from the number of replies that it's a popular topic!
i concur with others in general and specifics regarding the focussing on popular periods where there are currently gaping holes.
I'd add that it seems sensible and productive to build on the periods that you already manufacture.
Classical ancients/biblical such as Egyptian empire, Assyrians, Babylonians, Mycenaean-Greek (building around what Mars has), Trojans, Hebrews and perhaps even some mythological characters and beasts.
Wars of the Grand Alliance to Spanish Succession currently the only options in 1/72nd plastics are to improvise with Airfix Washington's Army and the wonderful Great Northern War figures from yourselves and Zvezda (there are even precious few 20 mm metals if one is desperate to fill the gaps). Steve Rowland has made an attempt to begin a list, but this one is HUGE in terms of both nationalities and troop types.
Taking in both Grand Alliance and 'Marlburian' means that you have a troops with the 'floppy' hats through to early tricornes.
I'd like to add to this a call for some Poles of the Great Northern War please--currently improvisation with Thirty Years War types is the only option.
French and Indian War my focus is on the 1755-1760 conflict, but it could be expanded to include conflicts between the imperial powers in North American associated with earlier periods (Queen Anne's War and War of Austrian Succession), as has been suggested by others. This period, with its range of Native Americans, militia units and regulars in modified uniforms is crying out for the 'Strelets treatment' of a wide range of poses and uniforms in each box.
French Revolutionary and Consular Period builds on your current range for the Egyptian campaign. Others have pointed to the lack of Ottoman troops and early Austrians and Russians, but there are also French infantry and cavalry (more hussars, heavy cavalry in bicornes, dromedary corps, infantry in various uniforms--revolutionary infantry in ragged 'uniforms' is perfect for the 'Strelets treatment'!), German states and even more early British (including interestingly uniformed volunteer corps).
I'd add to this a "sub-complete range" that is currently lacking: a complete range of sets of Napoleonic generals for all of the nations. Sets of general officers and staff in a range of poses (preferably mounted) to represent some of the 'second-rung' personalities not currently covered and a variety of 'generic' generals and officers to be used to represent others. This would obviate the current requirement to utilise the available options as different personalities by simple painting conversion and/or more 'surgical' approach!
early American Civil War another untapped 'period' ready for the 'Strelets treatment' with a great range of uniforms of the various volunteer, cadet and militia troops, including the mix of Zouave uniforms and those in French chasseur uniforms. Yes, these latter can be improvised with Crimean and Franco-Prussian sets, but none of them are completely accurate.
Thanks again for the opportunity,