Merging 2 face loops into 1 - Topology So I'm trying to merge two face loops into one like so:



would it be detrimental to do this using tris? If so is there any way of doing this with quads only? Any help is appreciated, thanks!
Tris may or may not be problematic depending on your model :).  

These are some ways to reduce two loops into one.
Including 2-level Subdivision, so you can see the resulting geometry.



Further Reading:
Topologyguides.com