The ARRL stated in the September QST that it will file a Petition for Rule Making to delete all references to symbol rate. Although the article was focused on HF, an email exchange with the ARRL confirmed:
“The Board’s instruction is to seek the deletion of all references to symbol rate in 97.307(f). That includes (f)(5) and (f)(6). There is already a bandwidth limit in those subparagraphs.”
This will allow us to move past 56k until we fully occupy the channel.
For the 70 cm Band §97.307(f)(6) applies
A RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this part may be transmitted. The symbol rate must not exceed 56 kilobauds. A RTTY, data or multiplexed emission using an unspecified digital code under the limitations listed in §97.309(b) of this part also may be transmitted. The authorized bandwidth is 100 kHz.