Surely, all Wales - apart from parts of Swansea - is now backing the Bluebirds to complete the remarkable feat of taking the FA Cup out of England for the first time since 1927.
But at the other end of the footy spectrum, the outlook is black.
Can we contemplate Wrexham playing Conference football, leaving just two Welsh clubs in the Football League?
Cardiff City have faced a turbulent season.
They flirted briefly with the promotion play-off places before the threat of administration in a legal row over £24m in loan notes negotiated with the Swiss-based Langston organisation when Sam Hammam was club chairman.
Within weeks of a partial victory by their lawyers in a High Court case, the players secured a dream £1m final place by dispatching fellow championship giant-killers Barnsley at Wembley.
Bluebirds season ticket holder, Rhondda AM Leighton Andrews, who queued for hours to secure his tickets for Sunday’s semi, is now among tens of thousands looking forward to a return along the M4 on May 17.
Still with a croaking voice yesterday after cheering the side to glory, the deputy minister for regeneration admitted it was a nerve-stretching 82 minutes of play after hero Joe Ledley put Cardiff ahead with a sweet volley.
“The fans were terrific. The noise levels were significant. The team played very well and with one exception (when Barnsley striker Odejayi stabbed wide one-one-one with keeper Enkleman) we didn’t really look in danger.
“I drove up for the game with a couple of people and it was great along the M4 to see all the buses and coaches packed with fans with colours and flags.”
Mr Andrews would not tempt fate with a prediction for the final.
However, the occasion revived his memories of 1968 and Cardiff in the semi-finals of the European Cup Winners’ Cup...
Uefa must have a heart, and if they could allow Liverpool to bend the rules to re-enter the Champions League as cup winners two seasons ago, then a Welsh side should be handed a place Uefa cup place as English FA Cup winners.
Meanwhile, Wrexham AM Lesley Griffiths, who attends all the club’s home games, endured another dismal 1-1 draw at the Racecourse at the weekend and admitted: “I haven’t looked at the league table. The feeling among fans is that next year we will be in the conference. I can’t remember the last time we won.”
Wrexham are rooted to the foot of the Football League, seven points from safety with just six games remaining, reliant on other teams above them to slip up even if they put together a remarkable run of results of their own.
Ms Griffiths said: “When we were in administration I remember some Cardiff fans coming to the Racecourse to support us and singing their hearts out.
“I’m delighted for them, even though we are pretty despondent right now, I hope they go on to win the cup.”
Swansea City fan Dai Lloyd, Plaid AM for south west Wales, suffered as his side missed a chance to secure promotion to the Championship losing at home to Bournemouth.
Former Swansea player Leighton James was dropped as a soccer pundit by BBC Wales after suggesting 99.9% of Swans fans - himself included - would want Cardiff to lose the semi-final.
But Mr Lloyd enthused: “At times like these we should all rejoice in Cardiff’s success which will raise the profile of Wales around the globe.”
