Personally I think trying ways to get new supporters watching the cougars can only be god.
The long time supporter does raise a valid point however other clubs try various ways to get new fans so why not the cougars.
As a suggestion perhaps the club could do a promotion for the fans like the long term fan or any other fan by targeting a game for example Gateshead type where there is minimal away support and make it a £5 for everyone.
Whether feasible or not is for club to decide because at the end of the day they have to make money.