What do you mean "the tradiation whereby recent Zelda titles have had a 'Triforce legend' story for the original followed by a sequel that has no connection to the Triforce legend."? Only Ocarina of Time and Majora's Mask have done that so far.
But, I do think that you are right in that 'WW2' will be connected in some way to Four Swords. It seems a little too coincidental how similar the Hyrule Castle in
FS+ looks to the one in
TWW, that the
FS+ Hyrule is surrounded by water and the Link in the
FS games and WW look the same, when all previous Link's which have looked different (unless their stories fit in with each other).
Maybe you don't actually play the 'original
FS legend', but at the end of the next WW, after Hyrule has been found/made/restored or whatever, the start of that legend is suggested, like Link finds the Four Sword.
Arrgh, too much speculation!!