Wikipedia's article on Mark dates it as sometime before 70CE, not as an earliest date, but as a minimum - thanks to Leander and Ehrman. I am not sure how you can make the claim that 70CE is earliest or what most historians would say.
Mark alludes to the war that began in 64CE, that eventually led to the destruction of the temple in 70CE, but does not mention that destruction. Thus, for the majority of scholars, Mark must have been written before that moment.
Further, Burkett and Duling date Matthew to within a decade of Mark being written, because of similar events that should have influenced the writing if it was later, but did not. On the other hand, some suggest an even earlier date to 40-50CE (Wright, Wenham).
You won't be able to force the synoptics to a "much later date", as they were dated and discussed (poorly) by Papias of Hierapolis in 95-110CE. Therefore the works happened before this. As he was also "a hearer of John", you also can't date the Gospel of John after Papias was already dead.
The majority view is that the synoptics were written within living memory of the original witnesses, as I've already stated.
Mark alludes to the war that began in 64CE, that eventually led to the destruction of the temple in 70CE, but does not mention that destruction. Thus, for the majority of scholars, Mark must have been written before that moment.
Further, Burkett and Duling date Matthew to within a decade of Mark being written, because of similar events that should have influenced the writing if it was later, but did not. On the other hand, some suggest an even earlier date to 40-50CE (Wright, Wenham).
You won't be able to force the synoptics to a "much later date", as they were dated and discussed (poorly) by Papias of Hierapolis in 95-110CE. Therefore the works happened before this. As he was also "a hearer of John", you also can't date the Gospel of John after Papias was already dead.
The majority view is that the synoptics were written within living memory of the original witnesses, as I've already stated.