In case you didn't get the memo...
At the lower levels, Foosball is poorly funded/supported, poorly promoted and exposed, and not well organized. This severely limits youth exposure, and new intake. It is lacking organizers, venues (pool halls and arcades), and players in the mid-range to attract/sustain players long enough to develop competitive drive and community in all but the largest cities. Furthermore, to me, it seems at times elitist by discouraging newer players in various ways along the whole development path and at tournaments through a skills and table time "barrier to entry". Finally, it is no easy task to develop and build a committed mindset from newer players; Only a few who give it a reasonable chance maintain the passion and love long enough and consistently enough to develop competitive skills.
In my opinion, individuals with an active mind that avoid physical sports such as basketball, soccer, volleyball etc now have a wide variety of at home video games to choose from and/or can't afford to go to a bar all the time. This reduces the pool of players to friends and family of the few players that remain.
Fortunately, it is very possible to reignite the popularity of this sport. Players of all levels need to orient themselves at encouraging intake of newer players.
The three pillars of a successful Foosball community:
1) Equip your Community - Ensure your community has a good location and good tables. Important considerations are two high quality tables, hopefully all ages, easy access via transit or parking.
2) Promote the sport publicly - Foosball needs exposure both in the physical and virtual worlds. Important considerations are regular weekly events, social media, websites and search engines, popular public community events, community notice boards.
3) Welcome everyone - say hi to the new guy and keep him engaged through conversation and exchange, provide lots of table time through round robin, DYP, and playing with the new guys. Do not try to restrict or control access too much because every player is valuable.
Good luck!