My internet usage would fit on six 33.6kb/s modems on average

.. and only a handful of days in the last year would have come close to saturating a T1 at its nominal 1.544Mb/s. Still, that's a total of around 800GB/year downloaded. Something big would have to change before I could switch to metered cellular data; the upload and download taken together would cost about $1000 a month with my current cellphone provider.