Brodeur's abnormal career path makes it difficult to project what kind of a decline he will see as he ages. He is already defying the standard projections on aging (check out this post at Mc79hockey from three years ago that outlines how Brodeur should have performed over the last few seasons based on typical averages), and has now come back from a 4 month injury break apparently without missing a beat. I think the observed results suggest that Brodeur is not going to decline in a typical fashion, and he may very well be able to keep up his current level of play for several more seasons.
There are many New Jersey fans that lament Brodeur's lost season during the lockout, as he would otherwise already be the all-time wins and shutouts leader. However, looking at this graph one has to wonder whether taking that time off was possibly a good thing for a guy who played both more regular season and more playoff games than everyone else in the preceding decade. I doubt we will ever know for sure, although there is a lot of research that can be done on the relationship between the rate of decline from injuries and aging and the games played and shots faced by a goalie.