Stubborn, actually that "idea" of indefectibility is based essentially and substantially on Mediator Dei, Mystici Corporis Christi, Auctorum Fidei and indeed Vatican I and Trent, as upheld by all pre-Vatican II theologians. At any rate, this isn't even about indefectibility per se, it's about what is the best approach going forward to overcoming some of the problems in the mainstream Church, it seems to me some people still prefer idealistic and utterly unrealistic scenarios to practical and doable ones.
I must say I have every respect for the people like yourself of the older generation who, I imagine, must have endured very much to attend the traditional Mass at a time of great upheaval. I think the authorities made many mistakes in their human capacity. But, for all that, I don't think that therefore every suspicion you have of the authorities becomes therefore necessarily correct. In forming a true judgment on the situation, what the faith says and what indefectibility requires, as bare minimum, in my opinion cannot just be set aside or ignored, otherwise we will make a mistake somewhere.
SSS, I think you are confused. Who mentioned the new Code or Vatican II here? We're talking about two different things, I think you misunderstood my post. This isn't even about canonical regularization of the Society, which is related but distinct. Bishop Fellay proposed among other things the addition and reintroduction of some of the prayers in the traditional Mass that find no equivalent or replacement in the new, saying this would be a big improvement, a step in the right direction. The difference is one of feasibility, it can easily be done, it will easily be accepted, it has already met with favorable reception on the part of some Roman authorities. All this while nothing necessarily changes on the Society's part and things continue as they are.
Bishop Fellay is not the only one, even in the Society, to speak favorably of such an idea, nor is he the first. Priests are thinking men, they don't rely on rote or stale answers as new challenges present themselves, they apply their knowledge and judgment to find reasonable ways to resolve them. Don't take my word for it of course, but don't expect all Society priests to agree with you about what is the best way forward, I daresay even now a large majority would disagree with you. At the end, time will tell and the fruits will bear out which is the best approach to overcoming the crisis in the Church.