So while the article in itself is probably revocable, «the Supreme Court interpretation is likely to be that Article 50 is non-revocable, and therefore any case for revocability is going to be a lot harder to make». (politics.co.uk)
Following Sanchez - Graells» argument, it seems clear that requirements (ii) and (iii) of the CILFIT test are not fulfilled: Article 50 TEU has never been interpreted by the court, and the silence on revocability means that there is reasonable doubt as to its application. (europeanlawblog.eu)
On a related note, the potential revocability of the loan forgiveness eligibility letters strikes me as teeing up the mother of all promissory estoppel cases. (creditslips.org)