The more tokens added the better it is, even if unused it adds more credibility to the product and makes it sound more functional. It really needs to start creating business deals rather than rely on the public to use this wallet
Adding too much tokens isn't a good idea. Just look at how Poloniex, Bittrex and Binance add some token in their site. They need to make sure they will be only list good token even it's only a few.