I prefer class acts the way it is. If someone wants to write an article that is more in depth, it can either be split over multiple issues (like the Tokens of Faith articles) or expanded into something that can stand alone from the class acts section. I personally liked the Campaign Component articles, which could be another way of including non-core class (unless they've been axed entirely). Having one page for an idea for the core classes is great. Aside from the background ones (which aren't as useful to me), I've seen a lot of potential amongst the articles.
The only way other base classes might find their way into the section is with baby steps. The inclusion of the article for the commoner, which I found amusing, may be a step in that direction. If any other base classes are gonna be showing up in the class acts section, I'd be betting on the ninja. Simply because it showed up in the pages of Dragon and may be more accessible to more people than any of the Complete... books may be.