The 14 had range and speed, but using those abilities was very difficult. Midair refueling is headache on a carrier. The faster and further the 14s had to go, the more tanker aircraft had to be launched. They were great for fleet defense, sticking close to home, but were ill suited for escorting bombers on long ground attack missions. So as cold war battles on the high seas were replaced by pocket ground wars, the 14 lacked purpose.
The 14s weapon system, the phoenix, would not be acceptable today. It was meant for downing incoming waves of bombers over open ocean, where the enemy is clearly identifiable. It wouldn't work well in a mixed environment such as over Syria. So the 14 would need a new missile/radar to compliment its speed/range.