Yes! Let's do this!
Stealth transfers are already in the client so this shouldn't be a lot of work? Mostly just UI stuff? If yes, I don't think this will slow down the development of other significant features that are coming.
With this worker proposal completed we can acquire lots of hardcore fans and users. Those kind of people who will believe in Bitshares and want it to thrive. Those kind of people who will spread the gospel of Bitshares even without any compensation. You should never underestimate the fanaticism of privacy oriented people. These people might be
our powerusers.
Little caveat: To get the full benefit from this, I think we propably should have better liquidity in the smartcoins. Price stable currencies + stealth transfers will give a user experience that make (certain kind of) people fall in love with Bitshares. So maybe there is no need to start to implement this right now today – but in the near future, absolutely.