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I don't see it being made much longer because it isn't a flipper, isn't assisted and/or isn't on bearings.
I like the 0560 better, but am really looking forward to the 0562. Just to confuse things further.
If the 0550 were to become discontinued, I don't imagine those would be the deciding factors. All of those features existed well before the 0550 began production. For other examples of highly successful knife models that use none of the above, see Strider, Emerson, Kabar, Cold Steel, and almost all of Spyderco and Benchmade's product lines. As mentioned earlier in this thread, the 0560 seems to reach a narrower market due to its larger size (as evidenced, at least in part, by the existence of the 0566). If I had to wager a guess, I'd say the 0560 would fall off the catalog before the 0550.
Anyone deciding between the two should try both at some point.