I think not everything bad about the Dalish looking for their heritage.
They are already different from what the elves used to be , their empire and culture crumbled ...they build a new culture with bits and pieces , and I'm pretty sure it's heavily influenced by their nomadic lifestyle.
At one point , they will have to think about where they are going .Probably going to happen when/if they get a land.
The main good and bad is , as far as I can tell , their old empire was very pro magic , and they were better than current mages.Humans and Dalish alike.
Finding about the old mysteries might help a great deal.There's a lot of magical trouble in Thedas .
Now the thing about lost history is we have no idea if the ancient elves went through some magical catastrophe too.
I'm unsure if the Eluvians are 100% safe for example.
And the red lyrium idol in DA2 is an example of "Please don't touch magical creepy things , they are hidden and lost for a reason."
I don't want to go on a Merrill debate , but we saw her willing to loose a lot to regain pieces of the past ...and her clan who was ready to leave some things behind and move on.
Possible we will see more case like this , with some Dalish eager to embrace and reclaim a magical past , and others who feel like some things are best forgotten.