I don't think this would help new teams to catch up, as "tanking" in the first few seasons is the best way to catch up faster later on.
Adding cheap, but old high salary players does not help too, as those guys just mean negative assets. If the raised salary floor was connected to some other change, targeted towards new teams (even larger arenas to start with, higher subsidies, whatever), I'd welcome such a change.
As we have a huge problem in retaining new users, the already existing obstacles to have an easy and carefree start should not be raised even more.
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