I like Harry! You need to build layers in a set of characters. If everyone one was as big a personality as Tuvok, The Doctor and Seven of Nine or as feisty as B'Elanna or as determined as Janeway it would be too much. He's the straight guy to Tom. He has his own quiet, dignified set of traits.
Neelix is the one that I think could get the chop - but that's just me and I haven't seen the whole complete series.