Most people support Bhelen.
They do? Which people? Perhaps a disproportionate number of people on this forum do, because they compare epilogues, but I'm still not sure it would be most. Orzammar dwarves? I thought most dwarves with castes supported Harrowmont, aside from that one merchant. The casteless dwarves don't talk about Bhelen. I'm not sure there's much of a compelling reason to support Bhelen if you're not a dwarf commoner, or a poorly adjusted serial killer like Zevran.
I played a dwarf commoner once. It gave me a compelling reason to support Bhelen in that playthrough and plenty of reasons not to care when I supported Harrowmont in other playthroughs. **** Orzammar! Orzammar dwarves suck.
But I suppose I'd still lend Orzammar aid in their fight against the Darkspawn. I would do the same for the Tevinter against the Qunari. How do I reconcile this with my belief that Orzammar can burn for all I care? I don't. I'm capricious AF, I guess.
I find it interesting that despite being portrayed as a rather grumpy lot, the dwarves never seems resentful about their fate, angry about it sure, wanting it to change, definitely, but never really resentful, not like the elves are, at least. Even though they basically got hit by the DA equivalent of the Geth and the genophage all in one go (mild exposure to the Blight severely decreases fertility) and unlike in other works of fiction, none of it was really their fault.
The dwarves in Orzammar are sovereign over their own nation, unlike the elves. Surface dwarves aren't a stigmatized minority, or at least aren't subject to nearly as much nonsense as elves (city elf or Dalish). Kal-Sharok dwarves are resentful (of Orzammar dwarves), but I don't think we've met any.
I'm also not sure their fertility situation is as dire as that of the krogan. Their species has been in decline for generations. In Mass Effect, there were living krogan who still had memories of their race's fertility being drastically reduced and seeing the krogan population rapidly decline.