Rolling back one block would allow me to create a new block of height 48070, and orphan the invalid one. From there it is possible to mine further blocks as per usual, BUT, another block with a wayward timestamp at any time in the future will cause the blockchain to stall again.
I guess this is basically an attack, of sorts, but obviously with good intentions. Anyone can do this right now, since the blockchain isn't moving - it CAN'T move in its current state - so the blockchain is basically completely insecure for as long as it's stalled.
How do we get a permanent node set up?