To be frank, more churches ought to be considering two services rather than spending the money to increase their sanctuary size.
I haven't listened to the links, but I'm guessing they may be about having two
distinct services on the Lord's Day (such as an AM and a PM), not two
repeated services. I love having a morning and evening service- it is very conducive to seeing the entire day as a foretaste of Heaven!
I don't want to hijack the thread, but, as to a church having two
repeated services, I honestly would not be comfortable with it at all. The same for the "satellite campus" movement. At least you have the entire church physically under the ministry. But you still have a split church. At the very least, I think there should be a unified Lord's Supper service. I've heard some say it's just like having house churches, but each house church, if I understand correctly, had its own elders and deacons.