I think the biggest problem is the lack of big stars in the bundesliga. Most german clubs cannot afford to attrack big names like Kaka or Ronaldiho, so therefor the bundesliga is considered less attractive. the reasons are mainly financial (Real Madrid just signed a contract for selling their broadcasting rights, they will receive 1.1 Billion EURO spread over the next 7 seasons) but also the fact that Brazilians and Argentines feel better at home in Spain and Italy where the sun shines more often
Hoeness once encouraged the other germans teams to buy biggers stars, and looking at the development of Diego (Bremen) i think that in the next couple of years the bundesliga can get better rates.
Another positive point is that the bundesliga got the highest amount of visitors!! For instance Bayern always have a sold out 69000 crowd when playing home, but also Dortmunt, Schalke and Bremen have lots of visitors.. maybe its because of the past WC this summer, dont know.
we can only hope that bayern does well this Champions League so the other big guns reconsider us as candidates !!
cheerz