HUSH. Go sit in the corner and think before you say such terrible things! 
Though I agree that an older LI would be a nice change. I just have theories about Beardy warden's story-line that make him not such an ideal romance for me. Tragic romances are not my favorite.
/runs off to Super Weenie Hut Jr's
I hear yah. As much as I didn't like it happening before (tragic romances) I don't see why it wouldn't happen again. I guess it's just a risk the player must be willing to take. I mean, if you think about it, an individual is taking the same risk with Alistair if you romance him. While he is only newly recruited in Origins the Calling would eventually happen, right? Though, I'd be especially beat up if you have to watch Beardy Warden deteriorate in game like Thane.
Somebody will end being disappointed anyway. I would just like more variety, than Marric's clone and an elf three game at a row. Skinny, hairless, teenage-looking male elves are not attractive to me at all. 
But the Marric clones... haaaaaa... bless Cullen and his fan-base, but all I can say is 'again?' It's vanilla, it's safe, and therefore it's boring to me. I had my run with Alistair, now it would be nice to see something different. But it is what it is.
An older LI would be quite refreshing for the series, I think. Beardy would remind me of Samara from Mass Effect in many ways. She is an extraordinary and under appreciated character IMO, and the mini romance is very well done. The fact she's probably the only potential LI who turns Shepard down out of duty makes me respect her even more.
If Beardy had to turn us down as well, I would both swoon and be heartbroken! Don't most Wardens avoid romantic entanglements, due to their short and violent lives?The forbidden fruit is all the sweeter.
Oh Samara, we could have had it allllllll~
I would have the utmost respect for the writer of Beardy-Warden if his turn-down speech involved him recognizing his situation and then making the decision to turn down the Inquisitor, knowing what the future will bring for them. (Such as the Samara mini-romance) However, it is possible he doesn't have that sort of self-restraint. There can be a point in ones life where they just stop caring because of the odds stacked up against them. As much as I don't want to see him in this light, he could have a destructive personality just like some of the companions in DA2. It would be a dick move, for sure, but fair-game. Or, I don't know, maybe they'll allow a cure for Beardy Warden in this game. There is a lot to speculate.