That just seems like wishful thinking. But I think there's a middle ground. He can be an adequate 80-90 start catcher by year 4 or 5, just like Yadi and Chooch. Chooch after he turned 34 went 1.6, 3.1, -0.6, 1.8, with the last two years as a platoon (86 games) and back-up, respectively. I'll take that (the 1.6 or 1.8, that is. Obviously the 3.1 would be great, and JT will still be younger than Chooch or Yadi at the time we're talking about).
If they move him off catcher or DH him frequently perhaps things change but I don't necessarily think he'll be an elite hitter at 32 or 33 regardless.
I think the Phillies can match any five-year offer with the most money. I don't think they'd want to give a guaranteed year with the most money. Could see them going 6 or 7 if it lowers the AAV considerably though, at that point you are just redistributing the bonus/buyout and sunk costs.