And your view could be called a very institutional interpretation of the verse. A building all too often becomes a place to ‘slip in, toss a few in the plate, slip out, and call it good... until next Sunday anyway. There absolutely is blessed pulpit preaching without a doubt. However, the most intimate growth and maturing, and I argue disciple making, often times occurs in the intimacy and vulnerability of a small group setting for which no building is needed.
I wasn't suggesting that a building is necessary. Consistent regular fellowship is necessary for true spiritual growth. I believe that is the point of the author of the Book to the Hebrews. As long as fellowship is regularly occurring and some accountability (even informal) is present, I wouldn't have too much of an issue with the idea of small groups or home churches fulfilling Hebrews 10:25.