No hits for a while now, when do they cross over into the nostalgia act jon is so desperate to avoid?

so whats to blame?
are the songs not good enough??
is it the fact bon jovi are writing the songs and not jessie j or bruno mars etc?
or is the industry loosing the likes of bon jovi who are now more likley to have no1 albums and tours as opposed to no 1 singles anymore

thoughts please??