You can't have a large influx of people from anywhere without the culture changing. You're going to get higher home prices and/or more sprawl, and more traffic either way. But you're also going to get more investment in the area, more skilled workers, and more consumers spending money.

To give an example from California: San Francisco started as a Spanish mission town. Then it was a gold rush town, and then a major port and military base with a predominantly working-class population. Then it became a center of counterculture and gay culture, and then a tech hub with a very high cost of living.

Every time the city changed, there were people who didn't want it to change -- but the people who resisted change were themselves responsible for changing the city when they arrived. Similar things could be said about cities everywhere.

This is the lifecycle of cities. It's what happens in a free country where people can live and work where they want to. Unless you were one of the people who showed up on a wagon train and built Boise out of nothing, you aren't any different than today's newcomers.