megaman zero's possibility of contiuation

doees anyone  remember this installment to the megaman saga  staring zero it was quite awesome with challenging game play and great boss some of which having to be toned back to fit into the  gba cartridge. well anyway it occures to me that in its sequel megaman zx  they never said zero died on board Ragnarok. now i know what alot of you are gonna say "but we have bio metal z in zx so he must have died" well although  zero did die at some point prior to the zx plot it wasent necessarily due to ragnarok. you see neither the gaurdians x or axl died on ragnarock  there bio metals were produced later based on model w. so it is possible zero survived and was later simply transformed into a bio metal at a later poiint.

given this fact i think it may be possible that we may see megaman zero  5 someday after all they did produce 2 new  installments of the classic megaman so why not zero.