Cardiff's promotion to the Premier League last week means they will join Capital One Cup winners Swansea in the top flight next season.
It will be the first time two Welsh teams have been at the highest level of the English game and forms part of a resurgence in club football in the Valleys, given Wrexham have already won the FA Trophy and, along with Newport, are currently contesting the Conference play-offs in an effort to reclaim their Football League status.
And not even the fact bookmakers were offering odds on Cardiff's likely relegation before their promotion had been secured can wipe the smile of the face of Rush, who scored 28 goals in the red of his country.
"It is a fantastic time for Welsh football," he said.
"I never anticipated a day when we would have two Welsh sides in the top league and from a club perspective it has been one of the best years ever.
"I know what people are saying about Cardiff going straight back down. It was the same with Swansea.
"But that didn't happen and now they are in Europe, which is terrific.
"Cardiff will be realistic. They will see their main job as staying in the Premier League and they will need to bolster their squad a little bit.
"It is already pretty good, but you need the strength in depth to be able to cover the two or three injuries you are bound to get and which could make a huge amount of difference to results.
"I am sure (manager) Malky McKay knows that and hopefully it comes off for them because they deserve this achievement.
"They have always been the nearly-men, and I couldn't be more delighted."
Rush also sees Wales' success from a different perspective.
As an ambassador for the 2013 FAW Community Football Awards - presented by McDonald's - nominations for which can be made at www.mcdonalds.co.uk/awards, Rush has a vested interest in trying to make the most of football's increased exposure in Wales.
Of the squad that got Cardiff promoted, only Craig Bellamy is Welsh, whilst most of Swansea's representatives are younger players from the academy.
Rush knows those numbers need to rise.
"We have to use this situation as a platform," he said.
"The standard Swansea and Cardiff are playing at now is very high. It gives Welsh kids a believable target to aim for.
"If we can get Welsh youngsters into those first-team squads the experience they would get from playing in the Premier League, or even being exposed to the environment, would be invaluable."