I'm fine either way.
I think if Togashi does add in more romance he'll be able to write it well.
If Togashi doesn't add in romance it won't take away from the quality of the story.
Whether or not there should be romance should be up to whether or not
Togashi wants there to be romance. Probably the big reason why romance
sucks so much in shonen is because I doubt the shonen writers actually
wanted to write a romance but instead do so to keep readers (mostly girls) interested.
I mean half of deviant art's fan art section is either Naruto x Sakura/ Naruto x Hinata/ Sasuke x Sakura/ or Naruto x Sasuke. Mostly the last one.
Gon and Killua are just too young for romance.
Killua is too sheltered and Gon seems too innocent.
Even as Gon has dated before it's hard to picture
the "dates" being anymore than hand holding
and Aunt Mito standing by and keeping watch.
Of course there are 12 years old who are dating.
But most of the time it's more about being "cool"
than anything else.