Firstly, that´s obviously something that you cannot judge, because nobody can know for sure who is in Hell. If we are told to judge people/groups/ecumenical councils, etc. by their fruits, that is necessarily referring to fruits clearly visible on Earth.
Secondly, you are quite wrong in assuming that the sacraments of the SSPX are not valid. Cardenal Castrillón de Hoyos, head of Ecclesia Dei, definitely does not agree with you. When priests, who have been ordained by supposedly excommunicated bishops, defect to Ecclesia Dei, such as the group you mentioned, they are not asked to be ordained again. What is more, **in practice ** all the sacraments of the SSPX are fully recognized by Rome. Mons. Fellay recounts how when he consulted about absolutions for grave sins that require the authority of a bishop, Rome replied that there was no need to bother, that “all is in order”. I can´t remember the source, perhaps I´ll find it later. This is a de facto admitance of validity, even though the Pope will not announce it officially.
Mons. Fellay also says this about SSPX marriages:
“On this point, let me tell you about the bishops from Gabon (Africa) going to Rome to ask about the validity and lawfulness of the sacraments administered by our mission priests there and whether they should record them in the sacramental registers of that country’s local churches. Rome answered that the sacraments of the Society must be recorded in the local registers. “Also the marriages?” the bishops asked. “Yes,” said Rome. That was the statement from Rome. With these words —despite all the things you may have heard! —Rome says our sacraments are to be considered valid. This is the policy in official Rome about sacraments administered by priests of the Society of St. Pius X.”