Whether or not everyone in the SSPX is in schism, their mean-spirited criticisms of the Pope and their rejection of his authority, in certain areas, are problematic, as is their rejection of the Second Vatican Council. Catholics who go to SSPX Masses risk being led into error by a group that is NOT in communion with the Church.
Moreover, now that the motu proprio has been issued, there is NO excuse for any Catholic to go SSPX chapels. I frankly don’t care if the SSPX ever reconciles with the Church but it would clearly be in their best interests to do so since the motu proprio will reduce their membership as people leave their chapels and return to the Church. Within a generation, the SSPX will be completely irrelevant.
The Latin Mass will not appease them, many of them think they are special and have special knowledge and intelligence that the average Catholic cannot fathom. They believe the pope issued the Motu Proprio just for them and they sneer in his face. They insist that he must jump through even more hoops to please them. They call him a Modernist who doesn't understand.
I for one am impatient with them and avoid them at every opportunity.
Well, just because the motu proprio has been issued, it does not mean that Latin Masses will necessarily reappear. If there is no TLM, there would be an excuse.