What's interesting with Bob is he probably doesn't have a lot of wear and tear on his body. The time he had some injury issues with his groin with Columbus, it wasn't any one major injury, and then he came back to win the Vezina again.
Looking at games played, there are some interesting comparisons. Bob has only three seasons above 60 games and no seasons above 65. For total games played, Bob had only played 700 games by the time he turned 36, while recent contemporaries that have played 1,000+, Fleury and Luongo by age 36 had played around 850 games (along with many 60+ game seasons and some 70+ ones for Lu). Quick by age 36 also had around 700 games, but he dealt with more injuries and had more peak games played years (couple 70+ game seasons and deep playoff runs earlier in his career). Also consider Bob's had less playoff games than the others until recently.
So given all that, if he stays in relatively good health and we pace his games, 950-1,000 games could be the level where he potentially drops off, which means another 5 years at a high level is possible.
Not saying I'm 100% comfortable with that and we shouldn't have a good pipeline/backup plan, but I was surprised looking at these numbers and this would suggest we have more time with Bob playing at a high level than you'd think just based on his age. So if he's our goalie for the next 4-5 years playing say 50-55 games in the regular season with a good development pipeline, sure I'm all for it.