As long as the connections do not pass through another server and anyone using the app directly connects to BitcoinTalk.org: Sure I wouldn't mind having a more compatible app.
Be prepared for a long development time. You could throw some of the development on Github to speed up the process and allow other members to contribute.
Connections will hit bitcointalk.org directly as running an intermediary server seems expensive and I can't really think of any benefits to that.
The only real reason as to why you would want to hit a server is to provide server based caching or a bit of an easier way to query the website (in terms of scraping).
Yet still people do it.
How do you plan on altering the app upon the new forum software?