I have never believed that Raj is gay, nor is Stuart. Both of them, when they have dated, have dated and been attracted to women. Both are simply very awkward around women and so have established their closest ties as male friendships. Since Howard is now less available, I think Raj will turn toward Stuart for that friendship. Stuart, who is also feeling lonely, will respond. That seems very natural to me and if the show takes it in the gay direction, I will be as disappointed as I was when Brothers and Sisters made Saul gay with no legitimate reasoning behind it. Gay relationships that make sense are fine and entertaining, as on Modern Family of Six Feet Under; those that don't are just absurd to me.