It was the right decision to make by drawing the 3 ships of Lucy all together without excluding any of them so we could see Lucy's reaction in each. He drew Lucy before thinking of choosing Natsu or Gray or Loke as a way to display Lucy's possible ships. Now everyone knows that Lucy likes Natsu the most and it's very important to end it because he start it. With that being said, ppl still can delude themselves as they want nothing would change the fact, The sketch is clearing pointing for Lucy's interest and she does like Natsu the most. Regardless i didn't see how it can harm a canon ship in anyway. Gruvia is already canon, Loke is a celestial spirit, there is no chance for the dead ships to comeback not to mention Lucy's choice.
I guess we should know more about Natsu's side, Yeah! romance ain't his best deal but his actions says a lot about it however it's not enough for me, I want to see from Natsu's side more.