First of all, Florida is not that small a state in land area. In total area it is 22nd. Note, NY with three teams, is 26th.
You are correct indirectly about one thing, pro football is not a big deal in Fla probably as there have been few great seasons for any of these teams in the past 20 years. The Jax area is not very large population wise either. My guess around a million...hard draw as college football is the main attraction here. Here are the numbers computed by someone else:
NFL Cities by Population
(in millions)
:NYJ :NYG New York 19.0
:CHI Chicago 9.6
:DAL Dallas 6.3
:PHI Philadelphia 5.8
:HOU Houston 5.7
:MIA Miami 5.4
:ATL Atlanta 5.4
:WAS Washington D.C. 5.4
:NE Boston 4.5
:DET Detroit 4.4
:ARI Phoenix 4.3
:SF :OAK San Francisco/Oakland 4.3
:SEA Seattle 3.3
:MIN Minneapolis 3.2
:SD San Diego 3.0
:STL St. Louis 2.8
:TB Tampa Bay 2.7
:BAL Baltimore 2.7
:DEN Denver 2.5
:PIT Pittsburgh 2.4
:CIN Cincinnati 2.2
:CLE Cleveland 2.1
:KC Kansas City 2.0
:IND Indianapolis 1.7
:CAR Charlotte 1.7
:TEN Nashville 1.6
:JAC Jacksonville 1.3
:NO New Orleans 1.1
:BUF Buffalo 1.1
:GB Green Bay 0.3 (112 miles north of Milwaukee 1.5 M)
Del Rio is a good defensive coach which is where he should stay IMO....not so good at the head coach.