Ummm... Let's just focus our attention upon what you want to accomplish here. You want to accomplish “a community portal,” and you judge that your efforts are “90% completed,” and your concern is that “your site might freeze.”

Very well. My advice to you is:   cross that bridge when-and-if you get there.

If you unhappily-discover that the tool or method that you have selected cannot meet your site's demand, then, I say, (and only then) “you have a problem.”

Until then, drink beer.