everything depends on the commercial outcome of these purpose-built sets. Should they prove to be a success, the line can be extended to other armies and periods.
Actual number of poses in a given set depends on its format (mini- or else) and number of moulds.
As time goes, we will find a right balance between variety, cost and return on investment. As you understand, none of these sides should prevail for the account of the others, otherwise it will all end up where Revell, Airfix, ESCI and other companies.