How could the banks entice people off trackers?

I was just wondering is there anything the banks could offer that would entice people off mortgages and suit both parties?

There has been a few suggestions thrown around like giving people a lump sum but this has been a paltry sum.
Is there any scheme that could help the banks get the trackers off their books that would appeal to mortgage holders?

It's discussed at lenght elsewhere.

No need for a new thread