As much as accuracy can be gained from comparing the sizes of both cities – Norwich and Swansea, for me as far as football support is concerned the true comparison can only be seen when you look at both club’s playing history – what divisions they played in, especially from the period of post WW2.
Norwich have never played in the fourth tier of the pyramid, they have had spells in the old third tier of Division Three South, flirted between Division Two and Division Three (South) between the two wars, and following the resumption of the Football League after WW2 Norwich played in Division Three (South) up until promotion to Division Two in 1958/59, when Division Three was formed in 1958/59. In 1960/61 they were promoted to Division Two and remarkably have remained in the top two tiers to present day.
Just one season in 2009/10 they slipped down to third tier of the game.
65 seasons out of which 27 were either in the PL or Division One.
Just imagine how very few supporters the club has lost in all those years.
List of Norwich City F.C. seasons - Wikipedia
Compare those statistics with the Swans – a truly YoYo club where despite reaching the FA Cup s/final in 63/64, slipped to the Fourth tier in 3 seasons.
A small revival in the early 70’s brought another drop back to the 4th tier and also having to seek re-election to the Football League, albeit with gates averaging 2069.
Another revival brought First Division football only for the club to be closed down for a short time midway through 1985 and the dreaded fall back to the 4th tier.
Yet another revival from the depths of the 4th tier saw success brought by Terry Yorath only to fail to work on Frank Burrows’s success and slip back into the 4th tier in the mid-90’s.
Another mini revival in 1999 was shortly dispersed back to the 4th tier with average attendances this time of 4963.
Under administration for two years saw the club enter a golden era that brought a new stadium and Premier League football only for the club fail to build on the success despite a takeover and new Board of Directors from the USA.
This for me is the true comparison between two cities, while one other advantage Norwich didn’t have was a top rugby club in the city that enabled those fringe fans in dark days to spend their cash at St. Helens rather than at the Vetch Field. Looking back through the years high rates of unemployment especially during the Toshack era were blamed on the club’s demise but for me the downturn came before the FA Cup run to the s/finals where average gates dropped to 10,368, and where a successful reserve team playing in the Football Combination was dropped in preference to saving cash and a reserve team competing in the Welsh League. Playing in the Football Combination team was restored in the mid-60’s but the damage had been done as far as nurturing quality youngsters were concerned for the first team.
Apologies for the long post but my feeling is complacency and fickleness amongst the residents regarding the football club is not short term but has been inbred in the Town and outlying districts in years prior to its being awarded city status. Whether the blame can be placed at the club's Directors, or a lack of finance, you make your own mind up.