I didn't say it's likely, but objectively it does have a shot.
Hans and Elsa are both alive, hot, single and unrelated, Hans has already expressed a desire to move to Arendelle and stated that he'd have preferred Elsa to Anna (because she's the crown heir, but still). Elsa does need to find love and marry and Hans, a prince of a neighbouring kingdom, would be a good match in a social/political sense. Also despite being the villain and ostensibly wanting to kill her, he did keep her from becoming a murderer and also saved her life at the ice palace. Hans has already been introduced in the Frozen canon and is still alive, just detained at the Southern Isles, so IF they decide to want to pair Elsa with a man, he's a strong contender. The only problem is his villain status.
However, Jen Lee has said that she sees Hans as a tragic character and a product of growing up without love, Hans' VA has said the writers have told him they have an idea and want to bring Hans back in the sequel and redeem him, and the dollset with Elsa and Hans had them exchange clearly flirting looks in the box art. Small things, but it's obviously not impossible.
Obviously he'd need to go through a rather heavy redemption arc and probably pull a Disney death saving Elsa from something and then get better because magic, but it's not impossible. Again, I'm not saying it's likely, but the ship does have a shot. Depends on what Disney wants. Redeeming a villain into a love interest would definitely be a new and fresh thing, though.
And regardless of whether it happens or not, having a small shot at becoming canon is better than having no chance in hell, like with Kristelsa or Elsanna. Or maybe it's worse, because there's that maddening sliver of hope.