Chrono has been stopped because most of the original development team for the series have all left Square, in fact the one guy still actually working for the company (not freelance) has said he has no interest in making another game after the original. SE says they will make more if the game sells more but they have also said they won't make it cause they refuse to make a new Chrono team and would prefer to bring back most of the original team which will be very difficult to some extent.

I'm pretty sure the Ogre Tactics series has a similar issue since the brains behind the series no longer works at SE following his departure midway through the development of FFXII.

I don't really think SE suppresses their other titles as much as I would argue they don't properly endorse their other non-FF/DQ/KH titles. The Mana series and the few Front Mission titles released in the PS2 era got little to no exposure in order to build hype for the games. The "World of Mana" compilation was nearly released all at once and most people don't even realize Front Mission 1 got ported to the DS let alone that Front Mission 5 and FM Online were both released in Japan only.

SE makes weird business decisions. I'm still peeved that we will never see Sigma Harmonics outside of the country.