Because DeBlasio is inexperienced at his job? He's probably thinking he can wait us out and force CFG to accept the debt payment.
Only that won't happen and at some point a political opportunist will say something to the effect of, DeBlasio prefers to let his friends pay no taxes and not pay their debt instead of foreclosing on properties for redevelopment.
I think what he's not realizing is that Yankee stadium is a reasonably comfortable home for us right now. Sure it's not amazing, but it's shitloads better then red bull arena in terms of all the peripherals like ease of access, and capability of transport network to actually handle a full stadium. What we have is essentially a problem that can be easily solved by waiting. And some timely donations to politicians that are running against DeBlasio.
The political donation model sure seemed to work for that group who wanted to ban horses in Central Park, less than half a million dollars apparently is enough to buy a NYC mays opinion.
As a fan I think that as time goes on the potential GAL stadium only gets bigger, and bigger stadiums have cooler shit in them and make for a way better game day experience. As much as we get taunted for playing in a baseball stadium, it's going to be fun in a few years throwing the fact that our stadium is twice the size of theirs back into other teams fans faces.