Wow I never thought of it like that, but it is very interesting. Taking a bit to look back before I posted, Im not sure this was the case. If you look at each one case by case, it becomes a little clearer that this wasnt Vince taking a final shot at WCW IMO.
1)Steiner was the "big" free agent from WCW and it was natural for him to feud with HHH right off the bat. I think Steiner getting squashed at nwo wasnt so much because he was from WCW, but because of 2 things, 1)the Steiner/HHH matches werent exactly classics and 2)Evolution was just formed after the Rumble and they needed to look superior.
2)Booker T was thrown into the WM 19 title match because after the Steiner diaster, and that there really wasnt anyone else on Raw for HHH to build a feud with heading into WM. It was also a case where the WHT title match was like the 4th main event at WM that year, so HHH didnt have to have a monster feud that would climax at WM this time. I remeber reading that the match ended suddenly cause Booker hurt his knee that is why out of no where HHH hit the pedigree and pinned Booker at like the 9 minute mark.
3)Kevin Nash vs HHH had to happen mainly because of all the kliq history. Out of all the 2003 HHH feuds this was probably the best one because of all the history with Nash/HHH/HBK. The promos were good and you got good matches like Nash/HBK vs HHH/Y2J and even HHH/Flair. Lot of back history there which made this feud like I said the best of the bunch in 03 IMO.
4)Goldberg was a no brainer to feud with HHH in 03. While I think that the Nash feud was the best one in 03 with its storyline, I do think the HHH/Goldberg feud played out the best in 03 before Armageddon. HHH wins the Chamber at SS which everyone thought G-Berg would win, G-Berg wins at unforgiven and S-Series which was surprising. Then came Armageddon. Goldberg booked to face Kane and the week of it changes to HHH in the 3 way. What a shock HHH wins back strap. Now the folk legend is that HHH told Goldberg "you will never see this again" which G-Berg has said was one of the main reasons he only did like 4 dates between Armageddon and WM20 but thats another story for another thread.
Except for the Goldberg feud, WCW was never really mentioned so based on those 4 points I donot think that 2003 was HHH vs WCW but it was HHH vs 4 guys who just happened to be WCW main stays.