It is possible.
Just had a letter confirming that I continue to meet the threshold for IB Payments and that these will continue. This time there was no date given for any reassessment just that I may have to complete a questionnaire 'in the future'.
Although I was very wary of the ATOS Doctor at my medical, especially as he initially seemed quite angry that I had forgotten to bring all my medications, he seemed to have a genuine interest and previous experience of my conditions and ended up seeming genuinely sympathetic. He volunteered some extra advice and promised to 'help' me which I took as a sign that the PCA would be in my favour.
I have never regretted subscribing to this site which has given indispensable advice and information, as well as the equally valuable moral support that have seen me through appeals, medicals and a tribunal as well as putting together a 'max strength' IB50 questionnaire.
Not sure what the future brings for IB claimants but for now I feel very relieved!