I definitely see Worf progressing to the rank of Captain in-universe but he will always only be a supporting character IMHO.
Have to agree.
Worf, as a character, has had his time. There have been loads of episodes on him, his honour, his family, his Starfleet-Klingon conflict, and so forth. Plus him putting the good of the one ahead of the many all but ended his career.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)