he has NO significant or iconic romances in the comics and the only one people offered is that he dated Shadowcat at one point, he has no attachments in that regard that are essential parts of his character.
Iceman has had several (albeit failed) relationships with women, starting with Opal Tanaka, and including Rogue and the aforementioned Lorna Dane (Polaris). In the comics, after the trauma she sustained out in Genosha, Iceman admitted that he still had feelings for her and they became a couple. It didn't last long, but it counts, and Iceman has been well-documented in the past as long having romantic feelings for Polaris, but at first she didn't share his feelings, as she was attracted to Havok. This is why I say it would have made more sense if he came out as bisexual (which is still gay). This way, he still comes out and it doesn't completely retcon all that was read. In fact, Lorna was a key part of his character (more so than Shadowcat) that when it was revealed that he was gay, the writer made sure that Lorna was in the conversation.
https://i.kinja-img.com/gawker-media/image/upload/s--F3z6ZXJk--/c_scale,f_auto,fl_progressive,q_80,w_800/hchgpxoczqv6zup4uvo5.pngNonetheless, what's done is done. No point crying over spilled milk. It's already been revealed since 2015 that he's gay, and I agree that it doesn't change the fact that he's an awesome character. However, new characters who are gay can still reach the level of prominence that Iceman is at if there is good writing involved. It was done for the Latino community in introducing Miles Morales, a half-black, half-Latino Spider-Man. At first, there was an uproar by some who said "Who the hell is this? Peter Parker will always be Spider-Man!" But that didn't stop Marvel. Eventually, Miles rose to prominence and became one of the most popular characters in Marvel -- even to this day. So, you can make a new character and still get the point across. The same can be done for the LGBTQ community. Of course some people will complain, but it won't change anything. Eventually, it will be accepted in time.
I feel like right now we are having mix feelings about him coming out, however, we will soon accept it and it'll be normal for us in the next few years. 
That is correct. As I've said before, it doesn't matter if Iceman is gay. Heck, I'll share with you all that my brother is gay. It took him many years before he finally came out of the closet. Sure, my family and I were initially shocked, but we didn't shun him away. We accepted him, as it doesn't change that he's still family. He's still the same guy -- and I proudly say he's still my brother. People will always complain about something, as you can't please everyone. When my
Phantom Four were released, one critic complained that everything had a religious connotation to it, but I wouldn't let that change the story. Some people will complain no matter what. But when it's all said and done, it will eventually be accepted.
On a related note, I think it's messed up that Jean Grey read Iceman's mind and forced him to reveal that he was gay. He should have came out of the closet
when he was ready. Oh, the prying of telepaths... There should be a code of ethics with heroes when reading someone's mind, as just because one has the ability to read someone's mind, doesn't mean that it's their business to know.