EM titles would sell "a" amount
Early SS titles would sell "b" amount
Late SS system titles would sell "c" amount
WPC titles would sell "d" amount
WPC95 titles would sell "e" amount
From a business perspective it's simply a question of profit and return on investment. I hate to say this, because I know you EM lovers are passionate, but there is a distinct increase in interest in later technology games. That is not a "diss" or anything, just a personal opinion.
*edit* as far as remakes would be concerned.