I remember selling As Seen On Screen(ASC) way too early, only to see it become a 10 bagger later in the year.
However, the freak explosion of the fuel depot right next door to their warehouse has resulted in the shares being suspended and a lesson to those who put all their eggs in one basket. The unexpected does occasionally happen.
If something bizzare happened to a key employee of Indigo or a serious fault developed either in hardware or software, then this would seriously impact on their development.
However, the development of hardware and software is very thorough by all accounts and so a failure due to that is unlikely.