Fanjita is not against 1.5 firmware.... he just doesnt approve of illegal isos being used. Since 2.00+ cant run isos, Fanjita wanted to create an alternative method to load eboots. With that in mind, he created the eboot loader, a tool that enables homebrew, BUT NOT ISOS. There will be no downgrader avaible ever from Fanjita, or Ditlew, so do not count on it.
2.7 Firmware in now out now... and personally, I think there will be a exploit within the firmware, that will allow you to downgrade. That doesnt mean you should upgrade thou, Fanjita may one day come out with a e loader that enables ALL HOMEBREW!