It is already on life support, support for win9x (not 4.

was meant to cease at the end of 2009 if I remember correctly. The only thing that change that was many businesses were still using avast 4.8, so that inadvertently gave win9x a pulse.
The business versions of avast6 have previously released and avast7 business versions have very recently been released. This is going to mean less and less 4.8 business users and that is why a firm date was given some time ago of the end of this year, so people had time to plan.
I rather doubt it will get a further reprieve as there are two different virus definitions streams and the end of support for 4.8 will mean they can concentrate on the one virus definitions stream.