The Enterprise and Reliant could be compared to the F-14 and F-18. The F-18 was cheaper to maintain, was more economical and could take on more roles. The Reliant's boxy structure lent itself better to different missions and could have modules bolted on easier than the Enterprise's more specialized design, IMHO.
The F-14, Iran notwithstanding, really had one mission in life: To protect its carrier by being a big, fast platform for big long-range missiles. As the threat of an all-out naval war disappeared, so did the need for the Tomcat. If that need still existed the F-18 could not fill the void. Unless there was some strategic niche the Enterprise
/Constitutions filled that disappeared at some point I'm not sure the two are parallel.
The only thing we know of is the mothballing of the military program of Starfleet from "The Undiscovered Country". I'm still leaning to the Enterprise as being part of that mothballing.