Zeppelin said:Yes, until the plane is located - there will be endless speculation.
Don't kid yourself. If the plane is located tomorrow at the bottom of the sea, and is successfully recovered and found to have gone off course & crashed through entirely dull reasons (accidents & malfunctions), the speculation will continue. No matter how well documented an event is, there'll be whackadoodle conspiracy theories. And the longer the mystery lasts, the less likely that the nuts will shut up.
Hell, at this point I'm pretty sure that if the plane and bodies are recovered tomorrow, someone will claim that the plane is a replica and the bodies are clones, with the originals all spirited off by aliens/time traveling models/superNazis/CIA/ChiComs/Bilderbergers/Templars...