I think we need to separate out the state of british tennis, from the game itself and Wimbledon.
British tennis is pretty much a joke. Wimbledon and tennis as a sport is amazing.
Check out the russian tennis club spartak: http://espn.go.com/espnw/news-commentary/article/8827683/espnw-russia-topspin
Piss poor facilities, but has produced: Anna Kournikova, Marat Safin, Dinara Safina, Elena Dementieva, Yevgeny Kafelnikov and Anastasia Myskina.
With a budget of tens of millions the LTA can't even produce players in the top 100.