Sending Smith to the AHL saves $1,075,000. The Rangers will still take a $3,275,000 cap hit. The Rangers need a D to replace Smith. The Rangers won't save much money playing a kid instead of Smith. Are the Rangers playing with their bottom pair made up of all kids? Are the Rangers going with a bottom pair made of Hajek/Fox/Lindgren? Whoever ends up as the 7th D is probably better off playing more minutes in the NHL.
The Rangers don't have any money to get a better veteran D.
The Rangers will need Smith's experience and versatility of playing both sides on D. If Fox needs some time in the AHL, the Rangers don't have many options outside of Smith. He is a below replacement level player but the Rangers are stuck with him.
The Rangers are so young in key spots at center and on D. I read the Rangers should go with Strome as the #2 center. How does that help them get a good read on what they have with their own young centers? The Rangers need a take a big picture point of view.
The Rangers invested first round picks in Andersson and Chytil. They traded for another first round pick in Howden. It's time to see what they can do. Take off the training wheels.