It's creepy that Alvida want to merry 17 years old luffy... i mean she's like 35?
i don't think the main charecters should go together in one piece. and, seriously, can you imagine luffy beeng romantic?!? i cannot.
were used to sanjis playboy mood, so it almost impossible that he can have one girlfriend. Zoro.. he doesn't like that king of things. as you probebly noticed, he was the only one who didn't took a sneak peek on the girls in arabasta. eaven the king did, but not Zoro.
I like one piece the way it is, without serious love affairs!