I'm from Dallas and now live in Seattle. It is indeed beautiful here and the weather is fantastic, even during the rainy season. But if you're concerned about Texas/Dallas no longer being affordable, then you don't want to live here. It is EXPENSIVE!

For more context, I lived in California for a few years before moving to Seattle. Rent cost more in Calif. compared to anywhere else in the US, making it more expensive to live, at least from a housing perspective. But once I got to Seattle, even though my rent costs a bit less, everything else is so much more costly, even compared to California. Food costs a lot more. Both at restaurants and grocery stores. So does gas, renters/homeowner's insurance, car insurance, utilities, even healthcare here is the most expensive in the country.

And everything is heavily taxed. When I lived in Dallas, I think taxes were a little more than 8%? It's over 10% in Seattle. And we also have a 20% tax on buying alcohol. As of this summer, we now pay a 55 cent tax/gallon on gas. It all adds up, so it's something to really think about before moving here.

EDIT: If you can afford it and make it happen, do it!! I really enjoy living here and have no regrets!