Well I think most Planetside fans finds the term mech highly toxic due to the history we have with BFRs and to be honest I would be very surprised if SOE ever decided to implement some kind of mech because that would really be placing them back out on the mine field.
Your ideas are interesting but like previously said I think it is better to simply skip mechs and put more focus on the regular vehicles that are available to us all.
The only good thing about BFRs today in PS1 is that they make excellent bullet magnets.
