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.
It will reappear since there are already people who are making arrangements for it. A few priests in the Diocese of Cleveland have said that they will celebrate the Mass. Also, my son attends the University of Notre Dame and he says that campus ministry has responded favorably to a request by students to have Tridentine Masses said on campus. Clearly, this excuse is not going to be around much longer and soon the SSPX will be nothing but an unhappy memory.