No. There is real serious money involved here. Usually, the people who self-host are maxing their runners (otherwise it makes more sense to use minute billing). So this will affect them by roughly doubling their servers cost. Think if some company had a $15K/month bill in self-runners, they'll now also get a $15k/month additional bill from GitHub.

Many people will switch for that kind of money.

We use dedicated machines for our runners. Each machine has like 16+ cpus, 64gb+ of ram. Costs are <2k per month. This pricing change would have cost more than the servers we're running on.