The small arena Problem is solved in 5 minutes. Just give new teams in higher leagues bigger Arenas. Many users and me too probably suggested that back in 2009.
But hey, this is not a sprint, it's a marathon! Who cares if it takes two years to compete - it's fun either way.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular