If viewers aren't ready for this then people using these viewers will just start seeing grey av's running around the sims.
This, as seen in the video below is the main priority for the team. It is also imperative to get a stable working version out and from their comments a lot of work needs to be done with the clock ticking for the roll out.
The video of the meeting is long but worth the watch if you want to have an idea of what direction Firestorm and Secondlife are going and the difficulty required to get there.
Story from Firestorm website HERE