The way I read it is that Sky took the opportunity presented by Wiggo's exercise-induced asthma and a quite-likely genuine medical issue to obtain the strongest possible medication allowed under the TUE rules extant at the time - even Wiggins said it was to 'level the playing field'. The moral question of whether anyone should be able to medically compensate for an illness in order to compete is arguable - and will be into eternity, no doubt.
However, the fact is what they did was within the rules, declared as happening at the time, and raised no objection from the governing bodies responsible - who had every opportunity to do so had they wished. There was no subterfuge, no attempt to hide what was happening. Therefore, as I see it, there is no reason for Sky or Wiggins to feel under any threat. The rules were subsequently changed, and will no doubt change again. But you can't judge people for actions which were legal and open at the time, but would not now be so.